A lot of REALLY good descriptions thus far, some of which have summarized my ideal existence "Heaven," but are only that - a summary.
They say that money cannot make you happy. True. Money can, however, grant you access to your ambitions, and your desires. The people that money fails to make happy are those who desire power and MORE MONEY!
Bypassing the notion that heaven liberates us of our mortal inclinations (food, reproduction, and boredom,) I shall enumerate my passions.
Academics: I would bring into my presence the greatest minds of all time and battle them endlessly per the confines of the mind. If they bested me, then I would learn from them until they relented. I would have a massive library, the likes of which had never been seen. The library of Alexandria, Congress, and London would all wilt in comparison. Every book written, and every book not yet written would be at my fingertips.
Cuisine: I enjoy cooking, feeding friends, and eating. Cook books from my library would litter my kitchen. Never would I have to clean a dish, and I would never run out of garlic. No food would be outside my grasp.
The art of love: The greatest obstacle I have ever encountered was the interference of the time/money anomaly. The things we do cost money. The time it takes us to do things costs money. We are in such a hurry for all the things we want to do that we forget to enjoy ourselves. I would learn to love a person with such unfettered intensity, angels would cry, and God HIMSELF would take notes.
The art of love making: I assume that this has already been well covered, however, I shall add the personal commentary, "I am a lascivious, proclivitous bastard and shall indulge my perverted mentalities."
Lastly, Entertainment: In balance with my indulgence of the arts, so too shall I indulge myself in the world of games; Those not yet developed, those long ago made. Table top or console, so shall I engage myself. With friends or alone, so shall I be appeased.