RPR is pretty unique. not a lot of public parks with granite domes with mtb trails. like, none -- at least in central Texas. the jump lines are all isolated to one corner of the park. there's miles of XC single track there, for all skill levels.
10 bucks day use fee is pretty freakin reasonable, considering the amount of trail, plus all the new circus stuff. they were build a second progressive drop zone when we were there. the biggest drop in the older one is maybe 3ft. on the new one, the big one launches you through the upper branches of a large mesquite tree.
but yeah, lots of dirt singletrack, jeep roads, and trails up high on the pink moonscape that are super fun.
my biggest gripe about the place is the signage. there's lots of it, yet it's all kind of meaningless unless you were the guy who put them up and just need a refresher to get your bearings. Trailforks app has a decent map (better than the one they hand out at rpr), but cell coverage is spotty.
just know that if the signs says "Trail", it's a jeep road (except for the original "Flow Trail"). if it says "Loop", it's singletrack. great place to get lost. we got all fucked up and went on a (frowned upon) night ride during a camp out, one time. and we still made it back. so don't be discouraged.
highly recommend tubeless tires with fresh Stan's. no shortage of cactus and mesquite out there. also recommend an early start, especially in the summer, and doubly so if you venture up on the Inner Loop, Decision Point (4star views!) or anywhere you would be on those slabs of granite/afternoon frying pans for any length of time.
and watch out for cowshit.
check their calendar. for example, I think there's a race, this weekend. a buddy was out there preriding with his son's team, on sunday when we were there.