Since I don't have $50/day type money, I would do these things if I had it:
And that's just the list I could make without stopping to draw breath (If I stuck to the identifiers rather than descriptions). I suspect I could come up with more, given a little effort. Even if I don't move, my trailer could use some serious work, not to mention a security system.
While some of those are luxury type things, most of them are serious health / quality of life-related, and boons to rationality besides (good health and books and access to more people seem like they'd help on that front, at least).
Books. Books are orders of magnitude more expensive for me than you, but the same principal applies. I have a good decade worth of books I haven't been able to read, and if I suddenly had the money to get them...
Assuming this is a money issue and not a time issue, your local public library can get you almost anything via interlibrary loan.
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.