When you check in ask them for trail maps of the area. The park is actually several park locations in the area and requires driving between locations. Places to see include: Old Mans Cave, Ash Cave, Cantwell Cliffs, Cedar Falls, Conkel's Hollow & Rock House.
The easiest hikes are Ash Cave, Old Mans Cave and the lower trail at Conkel's Hollow. Cedar Falls is pretty and you can park near the top and walk down I would say about 100 steps to see the falls.
All are worth seeing and depending how much you like to hike you can hike from many areas to another.
Been there many times and have even hiked it in the snow. I will be there Thursday through Monday this week. If you have specific interests or questions I'll do my best to answer them.