I've linked to a really good list of ideas for a great (no money) weekend. From bike rides to hosting a board game party, there is something here for everyone. Don't sit inside doing the same old thing, especially if you're married or in a relationship. Add some thrill or novelty and keep life fresh.
I might disappoint some by confessing I like to hang out at bookstores and enjoy some alone time without really being alone (code for people watching). It’s a great way to build observational skills. Money Matters