I came here a day after the area had been receiving a lot of run. I wanted to hike to Monkey Rock and the grotto. It was no problem. The place drains well. I hiked to the grotto and then came back to parking. It was about 4 miles I think. You can ride a bike to the monkey rock and then hike to the grotto to save time but then you may not see a porcupine sunbathing in a tree.