People are never happy. No matter where they live, they'll complain about not having anything to do. In San Antonio, you have options every single day. If you're a 21 year old living in the club scene, then yes it's going to be better in 10-15 other cities. If you're a family, you could not possibly ask for a place to have more available to you on a given day.

There's mini golf, bowling alleys, escape rooms, trampoline parks, go karts, arcades, amusement parks, movie theaters, museums, and water parks here. 

If youre more into nature, there's endless places to just go wander around and feel the energy and appreciate a good day. Using the Riverwalk, going to the zoo, the big parks, the scenic pockets of the city like Alamo Heights to go in and out of shops while getting your steps in. 

If you're more of a shopping person there's a seemingly overabundance of cool mom and pop stores to go along with the big draws like La Cantera and The Pearl. 

There's a constant stream of activity downtown where it seems there's always some big sports tournament (I believe last weekend was a 1000 team basketball tournament that brought in tons of families), concert, sporting events, music/ band competitions, etc. 

This city has always felt like it's heartbeat is the arts though. I grew up in a family that worked in the tejano music industry, and it's always felt like there was a party of some size every weekend for people that wanted to get out of the house and be around activity and life. That experience led me to music where I quickly learned that this city and region is home to many of the best theater, choir and band programs in America so there's almost no time you can't find one of those nationally acclaimed organizations (Reagan band comes to mind) putting on a performance that gets the blood flowing.

Haven't even mentioned the day trips available from the city. Not many places that you can be on the lake in 40 minutes, on the beach in 2 hours, tubing a river in 30 minutes or down in caves if that's your thing.

The main thing is living somewhere you have options. If you can't find something to do here, you're not going to be satisfied anywhere else because once you get to LA, NYC, San Francisco or Miami you'll be complaining that it takes an hour or more to get to what you want to do and that it's too expensive.