drummond island is a excellent place, totally worth the trip. this time of year though i wouldnt expect to see anyone out and about. i was up a month or so ago and only seen 1 other person on the off road trails on the island. earlier in the warmer session of the season i seen several others out and about. drummond ferry is cheap too, $16 covers you to and from the island for you, passenger and the jeep. just park in the line and wait to load up. you can also get your jeep badge of honor too while visiting the island if you check in with the app.
overall the vast majority of the trails on the island seem to be totally passable in a stock jeep and is very beautiful but i did take a trail and got off into some nasty stuff i didnt feel comfortable on and had to turn around. majority of the island is silty dirt and solid rock bottom a few inches below surface. you can easily spend the whole day on the island and not see everything you want.
the fossil ledges on the northern half of the island are pretty neat to walk along and examine all the shards of stone with fossilized remains of corral and other things im not aware of what exactly they are and the eastern side of the island has the "marble head" i wouldn't want to drive down myself.
as for camping on the island, i dont think its permitted unless at a campground which if i remember correctly they are privately owned and you pay via the honor system in a coffee can or something. i did a day trip twice now and haven't needed to camp out.
the off road park on the island is called turtle ridge but i know nothing about it. seen some rough youtube videos filmed there though, i dont think id be interested unless i had a highly modified build.
photos from drummond island
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ive not ventured onto trails yet this year as time has been kinda short due to my purchase towards the end of summer. but if in michigan, vvmapping does seem to do a pretty good job at keeping orv trail maps accessible as well as downloadable and even for purchase to install on a pretty standard car gps to get turn by turn directions for trails. just be sure to stay on 72" orv routes in the jeep and not venture off into the side by side trails.