It is one mile one way. Probably get wet. Go 3 miles to park entrance. Left behind are HUGE rocks. Designed for blind persons to enjoy.
Most preschoolers can handle if done at a leisurely pace.
Head west on Hwy W through Doe Run to Hwy 21. Within about a mile there is a sign to turn left to Elephant Rocks. St. Joe Lead Company donated land to state. Swim at Monsanto and Pim lakes. If you start at the first entrance to the trail, you go at a slight downhill grade.