Cana Island is a place I never would have stopped if it weren't for the reviews on TripAdvisor. After seeing that it was ranked #4 on things to do in Door County, I added it to our itinerary and I'm glad I did.
Admission to the 8.7-acre island is $6 and includes access to the original home of the lighthouse keeper and his family. It is an additional $4 to climb the 89-foot-tall light tower, which unfortunately was closed due to rain during our visit.
After touring the lighthouse keeper home, we ventured down to the water. Upon seeing the rocky shoreline and waves breaking quite far out, it was evident why a lighthouse is needed (still an active navigational aid).
I found it amusing that we seemed to see stone piles at each beach we visited during out stay in Door County.