Tulsa is nice enough, but you may want to skip it and OKC, there’s just not much here to see and your time might be better spent elsewhere. Rather than repeat myself, here’s what I had to say to another poster who was in town for a business trip:
…I predict you will discover that it sucks. The trees stop in eastern OKC…
…In OKC, the museum of art downtown is fairly small, but it has a big Chihuly gallery if you like glass. The Cowboy Museum is nice enough if you concentrate on the actual artifacts and ignore the bad modern day western art. The mueum of natural history in Norman is also nice, if small. There is another art museum in Norman, but I can’t remember the name. You can easily see all four museums in a day. The zoo is nice, if small. I’d avoid Bricktown during the day as it’s entirely restaurants and bars, mostly chains. The stockyards (the actual yards, not the 2 blocks of cowboy hat stores near them) are probably unlike anything you’ve ever seen, but not in a pleasant way. There’s a surprisingly large Vietnamese community around Classen and 23rd or so, with a large supermarket, but you’ve seen people shopping before and I doubt your are here to stock up on groceries, so not much excitement there. There is a windfarm with huge turbines near Weatherford (90 miles west), which is impressive, but not for more than a few minutes, you will see it from I-40 depending how far west you drive for your meeting. If you drive on I-40 at night, especially in western Oklahoma, you’ll see rigs lit up and drilling, maybe burning a flare if you’re lucky. Tulsa is smaller and nicer/more hip than OKC, it has several art museums and is about a hour and a half away…
…If you are into disasters, go to the bombing memorial, or go if you are into seeing tourists get all weird about complete strangers’ tragedies. Some things you’ve probably never seen before: bowls of melted cheese set out the chips and salsa at “Mexican” restaurants; 3.2% beer at supermarkets (wine and regular beer is only sold at liquor stores, warm); churches the size of aircraft hangars; an enormous cross at the 2nd street exit on I-35 in Edmond; a reservoir (Lake Hefner) where you can power boat and windsurf, but not swim.
If you do go back through Arkansas, and are interested in oddball attractions, there is Crater of Diamonds State Park. For a small fee, you can dig for diamonds, which are found fairly often. Nearby is Hot Springs, which has some preserved Victorian era bath houses.