Hours: Two Nation/Boldt Castle Cruise departs daily at 10, 11:30 and 1:30, late June-early Sept.; daily at 11:30 (also Sat.-Sun. at 10 and 1:30), early-late Sept.; daily at 10, in late May-late June. Glass-Bottom boat tour departs daily at 10:15 and 1, late June-early Sept.; Thurs.-Mon. at 1, late May-late June and early-late Sept. Boarding is 15 minutes prior to departure. Phone ahead to confirm schedule. Allow 2 hours minimum.