My frugal hobbies / pastimes - any similar ideas appreciated

Prices in euros but I guess that they may be similar in most places.

​

• Music (10€ a month) -
  An unlimited streaming service and I can listen to all the music I want, hours and hours.
  I invested in just some decent hearphones (100€ more or less, years ago) that gives a better feeling and I'm set.
• Cycling (initial cost + 5-10€ a month) -
  Bought a medium-range mountain bike with basic accessories and I'm doing countless hours of rides. It's one of the best "value for money" hobbies, that also keeps me in shape and fights depression.
  I only spend for some repair or upgrade but it's very cheap (especially if you learn how to do the basic manteinance). Sometimes I spend for a train ticket to bring the bike in a more distant place to explore new paths.
• Dog (40€ a month)
  Well... it should be in another category since it's my world (of course it's never recommended to get one only because of frugality - it's a living being who requires 100% committment).
  Countless hours of walks, people met, company, games, hikes together... Since it's a very small dog I only spend something like 10€ in good food, 5€ a month for full protection medications, 5-10€ a month for two vet visits a year and 5-10€ in biscuits and the occasional gift/new toy.
• Walking / Hiking / Trekking (free to few euros a month)
• Film streaming (10€/month) -
  Just requires one subscription to access more movies and show that you could watch in a lifetime. I like Amazon Prime (3€ a month in my country, prime membership included) and Disney+, for a total of 10€ a month more or less
• A good smartphone (initial cost) -
  I found a medium range smartphone that is worth like an high-end one.
  Once made the initial investment (400-500€ in my case), it gives me unlimited opportunities for entertainment and hobbies: free or cheap games that work well, photos that are good enough to share and engage in taking, and a screen good enough to write, read and as a tool for the other things (music, tv shows when I'm not home...)
• Smartphone photography (initial cost + free)
• Reading (0-10€ a month) - free from libraries and free ebooks, or just a new book a month or so to buy