BRUNSWICK, ME (AP).- An exhibit of Edward Hopper’s paintings of Maine is breaking attendance records at the Bowdoin College Museum of Art in Brunswick, but it’s just one of three top-notch shows at museums around Maine this summer and fall. Combine a trip to see all three — the others are an Andrew Wyeth show at the Farnsworth Art Museum in Rockland and a 1930s photography exhibit at Colby College in Waterville — with shopping in Freeport, the Coastal Maine Botanical Gardens in Boothbay, leaf-peeping, dining and maybe a trip to a spa, and you’ve got an ideal itinerary for a September getaway. In Maine and many other places, leisure travel takes on a more grown-up flavor after the kids are back to school. The Coastal Maine Botanical Gardens not surprisingly gets more visitors age 55 and up after Labor Day, especially on weekdays, but September is also a lush time of year to see the garden. Perennials have