Boat rentals aren't popular due to the large tide swings, iirc.
We did Dafuskie with an 18 and 28 year old - we all had a great day - lunch at Lucy Bell's, driving the golf cart around island - not an "OMG ... best day ever ... can't wait to go back" kind of day but it was something we all enjoyed and remember with happiness.
A highlight was the little jet boats we did from the marina and kayak trip.
If you' re on FB, there's an HHI group, PM me if you'd like the name.