Highly recommend! Some friends and I went to Kelly's Island for a couple days and did the Hike/Bike Tour with Dawn from Kellys Island Adventours. We also did the Kayak Treasure Tour and I would recommend both. Dawn is extremely knowledgeable about the Island, the Geography, the Geology, the plants, the birds, the water, the history ...... I could go on and on. She is very personable went out of her way to provide a fun time for all of us. We had a blast and would definitely do both tours again.
We had varying levels of bike riding skills in our group and Dawn geared our trip to that. We were on roads and trails, but nothing too strenuous. We also stopped fairly often to hear about the area we were in. The bikes are all-terrain bikes that were surprisingly easy to ride. They had plenty of gears to make it easy wherever we went. We were very happy with our overall experience.