I'd suggest half-day, depending on wind conditions it will likely be arduous paddling through wind and currents. Alternatively, pack a nice picnic lunch (can pick up something in Bayfield) and plan to spend a little time on one of the islands before paddling back. Be sure to check with the rangers for recommendations for your first time out.

The water is at its warmest in late August/Early September. That said, its still not very warm. I cant help with an answer on the child, though I believe they would be.

Apostle islands cruises. We took the grand tour. Great informational fun tour. Very nice ride

I brought my bike up to the Apostle Islands National Lakeshore last summer and was not impressed with the biking options. I did not see any shoreline bike trails.

It is cool about 65-70 degrees during the summer. If it is a warm day its very refreshing!

Bayfield kayak and we did the full sea caves tour

We took the evening tour that takes you around the farthest point.

There is no way of knowing when the Ice Caves will be open. I believe the WI Dept. of Natural Resources or Parks post it when they are. Even if you can drive or if there is no ice boat to Madeline Island after Christmas almost everything is shut down. The same in Bayfield. Love this area, however I would not go there unless you want to just go for hikes, snow shoeing or skiing. But if you want to do that, the Irownwood, MI and Hurely WI are better areas for X country skiing/downhill and snow shoeing.

The boat cruise is ideal!