Heeey! I live in Tulsa!

This is an easy one!
Okay so here we go:
Tulsa Zoo:It's about $8 a person. If you happen to be there on Fathers Day, it's only $4 a person.
Oklahoma Aquarium: $14 over 12 y/o, $10 for 3-12 y/o.
Tulsa Air and Space Museum and Planetarium: Adults are $12, Ages 4-12 are $7.
Oneok Field: Home of our minor league baseball team! Check out the schedule for tickets and game dates.
Brookside: Your DD's will LOVE this! Funky and unique shops, dining, and more!
Also, Check out the area around 71st and Memorial. There's a HUGE mall and a ton of places to eat! There's also a Dave and Busters (think Chuck-E-Cheese for adults. The kids can get it as long as you're with them), Incredible Pizza, and a GIANT movie theater nearby.
Utica Square is also a cute little area with shops and the like. (plus if you or your DD's have ever read the House of Night series, it is THE Utica Square with THE Starbucks that she goes too. And the school that the book is based off of is called Casia Hall and is right down the road.)
Any of the museums are cool. I LOVE
Woolaroc! It's one of the coolest places ever. You have to try a buffalo burger. Yummy! It's $8 to get in for over 11 y/o, and under 11 is free.
There are a ton of hotels. I've seen some really nice ones priced between $50-$100 a night.
Some advice: I'd stay kinda clear of the Admiral area near the airport. It's not such a nice part of town anymore.

But the rest of the city is AWESOME!
Downtown is clean and fun to walk around. There's the big long Riverwalk trail off of Riverside Dr that runs the whole length of the river.
Casinos are a big thing out here. But be advised you have to be 21 to enter so your DD's won't be able to go unless they're over 21.
Gas right now is about $3.75 just about everwhere.