Hours: Two Nation/Boldt Castle Cruise departs daily at 10, 11:30 and 1:30, July-Aug.; daily at 10 and 1:30, in Sept.; Sat.-Sun. at 10 and 1:30, May-June. Glass-Bottom boat tour departs daily at 10:15 and 1, late June-early Sept.; daily at 1, early June-late June and early Sept.-late Sept.; Sat.-Sun. at 1, mid-May to early June. Boarding is 15 minutes prior to departure. Phone ahead to confirm schedule.