Each woman has her own special errogenous zones. So there is no cut and dry answer to your question. Mwahahahaha! But seriously, experimenting with touch is half the fun! Of course the clit and breasts are going to be on the top is most people's list, but some girls are overly sensitive there. You'll have to ask the girl. If you want something more subtle, light touches on the small of her back or light kisses on her neck tend to feel good. The inner thigh is also an errogenous zone. Also, believe it or not, massaging her shoulders or feet could turn her on after a hard day. Knowing that you care combined with having you make her feel good goes a long way.