Wow, where to begin. Mohegan Bluffs is a strip of secluded beach with cliff on one side and the ocean on the other. The picturesque spot is magical and breathtaking, words cannot describe it properly. You MUST see this place if you visit block island! I recommend taking a blanket and either picnic or read a good book. It doesn't get much better than this place for relaxing and enjoying the beauty of things. A long winding staircase will take you most of the way down to the beach, but to go the full way down you must maneuver over some rocks (I wouldn't call it difficult but I wouldn't say it is easy either - I recommend sneakers to help!) Otherwise you can stop at the overlook when the stairs stop. My mother and I biked to Mohegan Bluffs from Old Harbor but you can drive, take a moped, or even walk (but the latter would take some time). If you decide to bike, you should know that you're going to have to bike uphill a lot. I am in decent physical shape and my legs got a bit tired nonetheless. My mother on the other hand had to walk some of the hills. The distance and effort are doable though and well worth it. I would also go so far as to say that this is the most difficult part of the island to bike. If you make it to mohegan bluffs from the direction of old harbor, the rest of the island will be less strenuous.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.