I don't own a car and use my bike as my primary method of transportation, and I use it to get to the grocery store, to the zoo, to the post office, to the library, to various restaurants, to parks, etc. I biked to/from work before I moved to working remotely. Fort Wayne, Indiana has a trail system called "
Rivergreenway" (along with many other trails) which goes makes it more convenient to get between different places in the city while mostly staying off of roads, and while avoiding constantly getting stopped by traffic lights at intersections. The city isn't huge, so if you live somewhere vaguely near downtown then you can probably reach most things you might want to. Though there are some areas that are more commerce-focused with busy streets and insufficient sidewalks. There are plans to fix this, though!!
Outside of biking to activities, I like to bike to parks and zoom around in circles. There was an event recently named "Open Streets" which involved closing 20+ blocks and I had this very long stretch of city to bike through, which I had a lot of fun with too.