I buy annual memberships in museums and gardens that belong to NARM, AHA and ASTC for ~$200 a year total, and that gets us into many of the major gardens and museums in our local area (plus the rest of the US if we travel) for free. Combined with library passes we can visit places like the Academy of Science, the Legion of Honor, the de Young museum, the state railroad museum, Asian Art museum, Chabot planetarium, the Oakland Zoo, the Exploratorium, tour the Hornet, see plays and much more all for just for the $200 membership costs. Plus our area has a lot of public parks, lakes, hobby clubs, meetup groups, beaches, bike trails, rivers for gold panning, public archery ranges, comedy shows, park events and gardens that are free or low cost.
So for under $200 in annual membership fees, a public library card, the cost of picnic lunches, plus gas are all we would really have to pay for what to us are pretty fun experiences for the year. The past year I received a garden membership with NARM and AHA privileges for a Christmas gift and I bought a planetarium membership with ASTC privileges for $39 with a half off Groupon offer and a $10 referral coupon.
For restaurants we usually eat out at lunch when prices are lower with a buy one get one free coupon from Entertainment books bought on sale, so that doesn't cost much more than eating at home.