On Griffy Lake Nature Preserve, you will find several rare plant species. Hikers are asked to please stay on the marked trails. Mountain biking, horseback riding and off road vehicles are strictly prohibited. Swimming is prohibited also. This is the longest trail in the park, it is the connection of 2 trails and they are connected to the IU Teaching and Research Preserve trail system. You will see beautiful views of the Griffy Lake. No fees.