The excellent sunrise side blog Thumbwind explains that Turnip Rock in Lake Huron can only be reached by kayak or canoe & share some tips for would-be explorers:
Paddling to Turnip Rock is not hard. Located at the tip of the thumb, it’s about a four hour round trip from Port Austin. This small guide offers a local point of view to avoid problems with the local law enforcement and property owners while being able to enjoy a unique natural wonder.
Despite its uniqueness, this natural wonder is located in the Pointe Aux Barques Cottage Community and is private land. Thus the only way to access it is from the water. Fortunately, that can easily be achieved by canoe or kayak. This means that you can’t go feet dry. Stay in the water. The area around the rock is monitored and even the topic of an Instagram account. If you must get out of our kayak stay as close to the water’s edge as possible. (Unless its an emergency)
During the weekends the number of paddlers can get quite large. If the area around the rock is crowded consider paddling a few hundred yards past the rock and view the overhangs and cave features that border the Pointe Aux Barques community. During the late 1800s, the cave were hideouts for fugitives. It’s worth taking a few minutes to explore. You may be tempted to get out of your kayak and climb the rocks for a view. This is a no-no and there are several signs reminding not to trespass.
DjOOF writes that they made it past Turnip rock and captured this view on the way back. See more in their Google Nest Pics album on Flickr. Also check out their shot of one of the smuggler’s caves referred to above!