2 1/4 Hours - Departing from Alexandria Bay, this international tour offers close-up enjoyment of historic and scenic wonders in both Canadian and American sections of the 1000 Islands. Professional guides unfold a colorful historical tapestry of the river, the islands, and the magnificent homes that you'll view on this special tour. As you journey through narrow island passages, surrounded by the natural beauty of the islands, you'll marvel at the majesty, diversity and originality of the island homes. Tour includes an unlimited stop at historic Boldt Castle (In Season).  All tours stop at historic Boldt Castle from May 10 to Oct 13 and on Oct. 18 and 19.  For an additional charge, tour the castle and grounds at your leisure, then return on any Uncle Sam Tour Boat or the Boldt Castle Shuttle. Stay as long as you wish: from 1/2 hour to an hour, or all day.