Dolphin Fleet. Tours are accompanied by scientists from the Center for Coastal Studies in Provincetown, who provide commentary while collecting data on the whales they've been monitoring for years. They know many of them by name and will tell you about their habits and histories. These trips are most often exciting and incredibly thrilling with close-up encounters. Chamber of Commerce Building, MacMillan Wharf, Downtown Center, Provincetown, MA, 02657. 508/240–3636 or 800/826–9300. www.whalewatch.com. $44. Tours mid-Apr.–Oct.