what's a good hobby to get into?

Art. Art is really entertaining :) you don’t have to be good at it to enjoy what you’re doing. If I were you, I’d buy a canvas and pallet of colours and start paining whatever comes in mine ( don’t be afraid to use reference).

I have several hobbies..... 

1.  Astronomy... (bought a good telescope for a few grand, But you can start off with a good smaller reflecting scope for around $800 - $1000.  Don't buy a cheap department store telescope) Even a good pair of 7x50 binoculars is a good start.  Every astronomer has a pair of binoculars even if they have a very expensive telescope.  2.  Coin collecting.  I like to collect silver coins.... and ancient Roman and Greek coins.    (Having a big interest in Ancient History helps)   3.  Meteorite collecting..... but that takes some research and money and studying who the well respected dealers are in the world.  I had lots of time for that while I was growing up... so accumated a good collection of meteorites... including a sample of the moon... (NWA 482) and a piece of Mars... (Zagami, Shergottite) which I ended up selling in my older age for a nice profit. 4. Stamp collecting.... I never had much interest in that. All these things take study.... reading text books... . educatiing yourself.. 

Fishing. It's cheaper than gambling but you still get a rush. Plus you don't have to be an expert angler to catch something.

Polo. Start shopping for a horse