I used to work at Adventureland. Bad choice. No more of that. The skyride and log chute are good, Space Shot and Sidewinder are excellent. Splash Over is not bad, though you do get soaked if the water is on and it can be mean to your crotch if you sit in the wrong spot. Dragon is terrible. Don't know why it still exists. Underground is a big waste of space. Tornado is okay - used to be better, don't know what happened. Outlaw is easily the best coaster in the park, but it's way too short. Don't bother with the train, it sucks a lot. They still have their Falling Star, and they run it pretty fast.
For the love of all that is holy, try the mini-donuts. They're made fresh right in front of you and omfg are they good.
Try not to die on anything. Employee training (and pay) are minimal. They don't see the danger in loose articles and they actually require that you take bags and things with you. It's amazing that this hasn't come back to bite them yet. Some day... I've complained about that enough on here, though. It's a nice little park with some pretty good rides. They desperately need a new coaster, but what can you do? Everybody seems to be surprised that Iowa has a place like that. And Des Moines is a super easy drive (and a really nice city, if I do say so myself).
As for Frontier City, I've only ever driven past it in the winter, so I can't really help you there.
