See where six rivers converge at Merrymeeting Bay to create a unique ecosystem; the breeding ground of osprey and bald eagles and home to Atlantic sturgeon and harbor seals. The Six Rivers of Merrymeeting Bay cruise certificate is good for two (2) people. Two days admission to the museum is included as part of the cruise certificate. The Midcoast Lights and Rivers cruise runs Monday - Thursday and the Six Rivers of Merrymeeting Bay cruise runs on Sundays from May through October.