Carnival Portland and Kennebunkport Tour

Has anyone done this tour through Carnival? I am not interested in renting a car but would like to see both places and have some time to browse the shops in Kennebunkport. Was the tour interesting enough for 5 hours?

Thanks in advance for any feedback.

Tablemates did this tour and they said they didn't have nearly enough time in Kennebunkport and that in hindsight, they'd rent a car and just go there... Barely had time for a snack and some sightseeing. The tour being 5 hours isn't very long bec. Portland tour will go out to Portland head light (very scenic outlook) and around the city before going to Kennebunkport. Lots to do in Portland IMHO and in Kennebunkport - maybe save one for return trip?