The Portland area is great for a vacation generally but where are you coming from? Just so you know, March is still full-on winter here.

March is still dang cold.

No. It sucks. Vacationland is all lies. As soon as you cross the border from Canada or New Hampshire your hair falls out and teeth recede back into your skull. Strange but true. The safest approach is via boat along the coastline but 3/4 of those that try are confronted by Nurash Yon'heldamath, who demands either your firstborn child or 37 cents, depending on the time and tides of your approach. Once you're here you cannot leave. Ever. Any friends or family who claim to have seen you after your return are being fooled by the Clones of Kitter'ee, who are slowly replacing tourists until they can rise forth as one and consume the world in a salty fog. Beware. Beware.

I'd only go to Maine for the beaches or the mountains.