I live in a HCOL area, but it's a very walkable location. As part of choosing to live here, I make very conscious choices on what I do for entertainment. Every month, I scour the event sections of the local papers to find out what events there are that interest me. Once a quarter (pre-covid) I go through the events calendars on the Smithsonian website and look for one-time events, lectures, films, etc. These are all free. There are so many fascinating, educational, and entertaining things to do that I rarely have to look any further for anything to entertain me. I've attended all types of events, from lectures, to book signings, to cooking demonstrations, dance recitals, history lessons, dragon races, sporting clubs, kayaking, river paddling -- all for free.
Books - not only do I use the library in-person and online (and download content from many libraries through reciprocal agreements), but there are tons of "little free libraries" all over my neighborhood. One of my goals in FIRE is to visit many different Free Little Libraries and map them out in my new FIRE bullet journal. And libraries are wonderful places for free events -- read their newsletters and subscribe to their mailings. Do things you wouldn't normally do, because they are free -- and why not? I went to a NaNoWriMo event once at the library and had never even heard of it before I signed up for it and learned some organizational tips and ideas for pushing myself towards goals (even though I don't plan to write a novel).
I also love to make lists. I don't like to collect objects, but I love to collect experiences. You can literally make scavenger hunts out of things of interest that you find in your area. And if you keep lists of your interesting things, you can categorize them and share them with others to make fun games out of the hunts.
I keep an email address just for events, so I sign up for more and get added to more event lists as time goes by. I get invited to (or otherwise find in newspapers) to almost every restaurant "soft opening" in my quadrant of the city. This means free food and drink at a new restaurant (it's a dress rehearsal for opening night), and I'm usually one of the first people to have tried a new restaurant because I go to these.
From the outside, some people think I spend a ton of money to be "the first" to try new restaurants and go to all of these events, but those who know me best know my methods and know it just takes a bit of planning. I am constantly in awe of the fantastic experiences I have and then amazed that they are free. I feel as if I'm the luckiest person in the world because I can take part in so many of these opportunities.