Get a massage every couple of weeks.
Go to some place to get some serious neuromuscula body work that focuses on posture, alignment, balanced muscular strength and tone. Feldenkrais, Hanna, Pilates, Alexander.
Have regular blood work done. Get basic dna testing, if not a full genome (yet).
Hire a cook to stock your fridge with tasty, nutritious meals for the week.
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.