choose your hobbies wisely. take ecstatic dance in oakland, for instance. its not very expensive, it will make sure your body stays a little fit, there will be great cahances to socialize and flirt. and you wont die.
compare that with motorcicle racing. it is competitive, male oriented, hard to find time and a place to do it, way more expensive, there are no women, it pollutes the earth, and you have to keep a motorbike in good conditions. not to mention you'll live 15 minutes less per hour ran, according to tegmarks old website.
The advice above of getting hobbies is a good one, but choose activities that are physical, social, and will make you healthy and sexy, unless you really, really, really love playing magic the gathering, like i do, then just nerd your money around and leave the other things to another time.
I completely agree with dance lessons as a worthwhile hobby to consider. The point I was trying to get at is that if you have disposable disposable income and free time and your hobbies are "books and computer games", you've probably not done worthwhile exploration as to what hobbies you enjoy.
On ChrisHallquist's post extolling the virtues of money, the top comment is Eliezer pointing out the lack of concrete examples. Can anyone think of any? This is not just hypothetical: if I think your suggestion is good, I will try it (and report back on how it went)
I care about health, improving personal skills (particularly: programming, writing, people skills), gaining respect (particularly at work), and entertainment (these days: primarily books and computer games). If you think I should care about something else, feel free to suggest it.
I am early-twenties programmer living in San Francisco. In the interest of getting advice useful to more than one person, I'll omit further personal details.
Budget: $50/day
If your idea requires significant ongoing time commitment, that is a major negative.