Bryce Nat. Park, Glen Cyn. Nat. Rec. Area/ Badlands Nat. Pk.

The Badlands (and crossing any of South Dakota) may be a bit chancey for weather ealy in April. Daytime averages are in the 50's, nights around 30. But there is a pretty good chance of colder early in the month. And even some snow, but probably not much. The park campground opens April 1, but the also pretty nice nearby KOA doesn't open until April 28th. So gives a clue as to what the locals think the "season" is. Late April should be much better.