I love playing with boobs, they are soft and wonderful and fun, but I don't think I'd really want a pair for a day. I love them when they are on someone that I love, cuz then it's connecting with another person and enjoying them and their body.
I would however, like to be a woman for a day to see what they experience. To see what sex feels like as a woman, and maybe get some insight into how they function and work things out in their head so I can know how to be a better man to my woman.