I will also say that getting your own labs done, even if you are footing the bill, is relatively cheap. You don't need to go to the doctor and have them refer you.

Check out ulta labs (obtuse, some learning curve) if you want to DIY, otherwise there's a couple services out there that make the learning curve shorter. One I see come up a bunch is Inside Tracker.

Health and fitness is a fun little side hobby that you can turn into a fairly intellectual exercise. Get hooked on Peter Attia's podcast, read a bunch of studies, get labs done, put together an exercise and nutrition plan and then get DXA scans to watch body composition change. It can easily replace other intellectual hobbies :)