I figured that gentle fondling of my small 34a breasts brings me immense feelings through my whole body; 2 out of 3 times it makes me very wet, and 1 in 3 times I even reach climax! It's often best through my bra and maybe a blouse because the material adds to the effect, although foamy lather in the bath is amazing too.
If you have someone with you, they stand behind you and massage them from behind. They can even work one hand on your mons and your labia, which feels doubly stunning in my brief experience! I learnt that - possibly sick though you may think - from my sister (3yrs older) when we showered after swimming once.