Uncle Sam Boat Tours offers a variety of tours through the scenic 1000 Islands. Featuring one-hour and 2 1/4-hour sightseeing cruises, luncheon, dinner, charter and craft beer and wine cruises, Singer Castle tours, round-trip shuttles to Boldt Castle on Heart Island and charter cruises for all occasions. All daytime tours offer an unlimited stop at Boldt Castle. Passports or other identification is never required. Daily 10 am to 7 pm; Early season and late season: Daily 10 am to 5 pm. Seasonal: May 1 to October 31st every year.