I would make it a 7 hour ride to Windrock for a 3 day weekend myself. Wayehutta is pretty decent but not very big for a whole weekend. What are you riding?
I can ride all trails that are worth riding 2-3 times in a day. I'd hit Windrock, Harlan, or AOP for a whole weekend myself. If you wanted to stop at Wayehutta and ride the trails on the way to another park that makes sense also.