St. Mary's is a cute and quaint little town. We ended up making three trip to it for different purposes, touring, walking, and meals at the several eclectic restaurants. There are two museums in town, one is a private museum honoring the submariners who have passed through Kings Bay Sub Base and another educating us about the uniqueness of Cumberland Island National Shoreline.
Cumberland Island was once a thriving community with several hundred people living and working there. The famously rich Carnegie family was attracted to it as a vacation spot from the city life. Over time, the Carnegies bought up plots and acres, then developed and built homes (mansions) for their children. Only one of the original mansions still exist and is open for touring, while the others are used as Park Service offices or are in such bad shape they can't be habited. To get to Cumberland Island National Seashore one must check into the Park Service office and purchase a pass for $10, free for senior pass holders, and a separate charge of round trip fare on the ferry, about $29 each.
Among the many other things we found on the island was that Major-General Henry "Light-Horse Harry" Lee III (January 29, 1756 – March 25, 1818) Revolutionary War hero, died here at the age of 62 and was buried here, before being transferred back to Virginia as his final resting place. He was the father of General Robert E. Lee, served as the ninth Governor of Virginia and as the Virginia Representative to the United States Congress.
Our planned 4 mile walk about the south end of the island, turned into a 7.3 mile trek. Most of the walking is on loose and semi hard sand surfaces, not advised for anyone with mobility issues. We were charmed with many birds chirping and singing their songs and later we found some of the wild horses and experienced their noted "unfriendly nature".