It depends on what you are looking for when camping. The Straits State park is nice... If you're traveling with kids, the KOA is set up for that (mini golf, swimming pool, game room, and a convenient tourist trap right next door). the Teekee campground (sp?) is, well, cheaper... I don't know of any boat rentals, but the new marina on Mackinac City side might have some info for you. If it's your first trip there and you're taking a boat out (please don't get offended) keep an eye on the weather. One side can be great with the other having 4-5 ft waves. It's crazy sometimes. It's not unusual for a storm to pass through out of no-where. Last year we were anchored and within a 1/2 hour they were calling for all vessles to seek refuge immediately... Straits Scuba is WONDERFUL. A bunch of really nice guys who know their diving. We often end up tying up behind them... I know our local dive shop is planning a trip there in July if you were interested in hooking up with them. Let me know if I can help with anything else.