This would be easier for me if I still lived in Florida. I'm not a big fan of Oklahoma, so I'm probably a terrible guide here. But this is what I'd say:
In Oklahoma, I'd say there are some good "hole in the wall" restaurants. My favorite is the Japanese restaurant, Tokyo.
The OKC Civic Center sometimes has decent shows and some aren't that expensive. (I've found some great Groupons for some shows).
We have a racetrack/casino. I don't care for gambling, but I sometimes like to watch the horses run. There is also the Riverwind casino, which gets a lot of big name performers traveling through. So does Chesapeake Energy Arena.
As a small, inexpensive thing to do, there is a comedy club near me.
There are some interesting Escape Games in the area for a group thing.
Also, Top Golf is fun for just hanging out and smashing balls with a golf club. You try to hit the targets.
Lake Hefner is OK to walk around. I'm having trouble finding a lot of beautiful places to walk around in Oklahoma. The botanical gardens here are ... ok, if you're bored. Pretty sparse for the $7-8 bucks you have to pay to get in. I'm spoiled by the one I used to go to in Orlando, I guess.
Of course, the Downtown areas have bars. Horse and carriage rides. Little boat rides in the canal. I haven't done much there. It's not my scene.
How about where you live?