There are also a number of shallow sites suitable for snorkeling and kayak visits.

Frequent fog and congested shipping added to the count of shipwrecks in the Straits area.

Half a dozen lighthouses in and around the preserve testify to the dangers that existed prior to the invention of radar in the 1940s.

One modern wreck within the boundaries of the preserve is Cedarville, a lake freighter transporting limestone that sank in 1965 after a collision.

Further east off Arch Rock, a drowned, 100-foot (30 m)-high waterfall formation, Mackinac Falls, was discovered in August 2007.