Once you've trailed down as much as you like, or your woman likes (each woman has a different area of the neck that sets her on fire). I'd try the spot where neck meets shoulder or just a bit above.
Just kiss this area, lick it like you'd lick a popsicle (meaning no pointed tongue anymore), suck gently, and maybe a bit of nibbling if that's what's desired. You may also like to trace shapes with your tongue here. Feel free to kiss gently up and down the neck, going from the spot where neck meets shoulders back up to the earlobe and then down again. This is very relaxing and yes, you want your woman relaxed. It will still keep her excited, so no worries.
Shoulders: Not many women prefer here but it can work if she's already in the mood. Same idea as with the neck. Kisses, nibbles, tracing.
Collar bone: Definitely a great spot. Again very simple with just kissing, nibbling, sucking, tracing.
Inside of elbows/underside of wrists/back of knees: These all go together because the skin here is fairly thin and sensitive to heat and touch. With the elbow you can start at the shoulder and kiss/lick your way down and then take her arm and bend it slightly or all the way, just so your tongue can slip in and out of the fold here. Don't let your tongue get too wet but don't let it get too dry either. I'd say your best bet is going for more wet than dry.
You can do that or you can leave the arm open and kiss and lick this spot.
Same thing applies to the back of the knee.
As for the wrist just kiss and lick and if you like you can nibble. But with nibbling don't try to grab some skin between your teeth unless your woman likes feeling pinched. Turn her wrist so you can bite the top side and bottom side.
Fingers: Men aren't the only ones who like their fingers sucked and licked. Basically however you like your fingers sucked and licked will work with the woman. Also try holding two of her fingers together and sticking your tongue between them. It feels a little slimy to her but still good. This might set her giggling or laughing but she's still in the mood (unless she hates slimy feelings).
Palms: One of my favorite places to lick on a guy. It works for women, too. Tracing with your pointed tongue works as does plain old licking and kissing. Hold her hand close to your mouth and let her feel your breath on her palm. Hold her palm over your lips because their soft skin feels nice. Then slip your tongue out to just barely touch her palm and trace around. Basically what you used to do as a kid when someone put their hand over your mouth to get them to take it away.
Breasts: This is where you can use your hands as well. Now guys, kneading is good and all but if I go by my preferences, it's not that great. Do some kneading (lots if your woman likes it) and then move on to using your finger or tongue to trace all over and around her breasts. You can tease her by getting close to her nipple and then pulling away. When you do actually take the nipple into your fingers or mouth here's what you can do:
With your fingers gently squeeze the nipple between them and roll it between your fingers gently. If you like try it a littler harder, the pressure depends on the woman (and sometimes how turned on she is).
With your mouth you can lick her nipple outright or you can suck it gently or hard and flick your tongue over it. She may jerk a little bit or gasp when you do this. Also you can take her nipple between your teeth and very gently apply pressure. Just like you wouldn't want a woman chomping down on your dick (unless you like pain) a woman does not want you clamping your teeth onto her nipple.
Between the breasts: Now here is one of my preferences so I figured it's a good suggestion. Simple kissing and licking is good here. Or you can combine the two. The best to explain how this is done is pretending like you're one of those sucker fish you see in the tanks at the store. Your lips are pressed to her skin and your tongue molds into the center. Wiggle it around.
Hold her breasts together and run your tongue between them. If she likes this she will love your dick between them with some lubrication.
This is a very new spot to me so I have no idea what's so nice about it.
Hip bone: This one you will have to be very careful with. Plenty of people are ticklish in this area. To get this right you will need to move slowly when approaching it and apply the right amount of pressure.
Too much pressure and it's no big thing, oh wow you're licking there, how nice. Too little pressure and she might buck and hit you in the nose with her hip bone and then the fun is ruined and all because it tickled.
To make this easier on both of you when you go for this spot put your hands on her hips with a thumb or finger very near the spot you want to go for. This will desensitize her skin enough so it doesn't tickle when you put your lips to it or your tongue. It will still tickle if you don't apply the right amount of pressure. But it won't be so hard to figure out.
Once you've got your tongue or lips on her here you can let go and use your hands to maybe fondle her breasts or run a finger between them. Or if you like you can play with the hair on her mound, but be careful as that may very well tickle her, too.
Now once you've gotten going this area is very much like the collar bone. Some sucking works wonders. Don't forget the tracing, licking, and kissing.
Inner thighs: This is a spot I wish men would focus on more. You probably should not go for this spot until you are ready to start playing with her down there. You can torture her by kissing and licking this area.
Use your tongue to trail up and down the insides of her thighs. Just as you reach the spot where her leg attaches to her torso go back down. I have also found that the skin between the thigh and the mound is very sensitive, much like the elbow, wrist, and back of the knee.
Using your tongue you can trail up this area between the thigh and mound and I can guarantee you that she will be wanting you to go down on her so badly she may start moving her hips. Whatever you do next is up to you. But don't leave her hanging too long or she'll get too frustrated and the mood will vanish.
Also sucking along that skin is great as is doing that along the rest of the inside of the thigh.
Lower back: Sound like an odd place? I know. The skin on the back isn't as sensitive as we'd like but it'll do. Now why the lower back? Because it's such a sexy area. You may also lick and kiss between the shoulder blades, just under that knob in the spine at the base of her neck.
Simple again. Just kiss, suck, and lick here. Tracing is good, too.
Ankles: Not the most sensitive of spots but there is a bit of thin skin just under the inside of the ankle. Pressing here with your tongue will have some affect on some women. Same thing as with the other spots on the body with thin skin.