Time is probably the best thing you can buy for the long term. You could consider investing that money and at 5% you'd have almost a million dollars in 25 years - that may sound like a long time, but it would mean you could be financially independent in your early forties and would allow you spend an additional 8-10 hours a day on things you enjoy if you didn't have to earn a salary.
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.