Some useful links.

Apostles Island area now has network of sensor bouyes. Wave high, wave direction, wave duration and some have water temp.

https://infos.cee.wisc.edu/wisc-watch/

Campsite GPS Coordinates

https://www.nps.gov/apis/planyourvisit/campsite-gps.htm

Coastwatch estimate water temps

http://www.coastwatch.msu.edu/superior/s15.html

Apostles hiking trail and shoreline info

https://www.nps.gov/apis/planyourvisit/trails-at-the-apostle-islands.htm

Shoreline info for Primitive Camping islands / zone's 

https://www.nps.gov/apis/planyourvisit/primitive-camping-zones.htm

Campsites directory (with description)

https://www.nps.gov/apis/planyourvisit/campsite-directory.htm