Indulge yourself with good cinema and see a movie you are already old enough to digest and understand:Salo, or 120 Days of Sodom by PasoliniIMDB Link
After that drink a Leffe
or any other variety of Abbey Beers ... there's more to the world of beers than your regular run of the mill "beer", if you don't drink, try Mead
, the real one.
If you alone and lucky get yourself 2 women of diff ethnicity to share your bed at the same time, else pay for it. Paid or not paid the experience will be very gratifying. Or men if you into that, all that matters is the experience.
If you can afford it travel to a diff part of the world that you are used to, like South/Central America, some Asian countries of one of the strange island nations in one of the oceans of the world, alone. If you can't afford it, travel alone to a diff city of your country because you can, alone. Being alone in a strange environment is a very enlightening experience.
If you have never rode a horse, do it. And do it for a while, after a certain ammount of time, let it idle by and move of its own and experience the power of such a beast, horses are simply marvelous, then run with it.
Drink stuff that you would never on a regular day of your life drink. Go to any supermarket and buy all the diff types of beer/soft drinks they sell, try them and see what you really like or not.
If you like meats, eat all available cuts, you can order them in small quantities for a single dish in a good restaurant.
Those are some of the things I remember most fondly from when I was young, different things. Just a suggestion, Happy Bday man! Enjoy it!