Anonymous wrote:4.5 year old. We went to Ogunquit ME. It was great. We hit the Trolley Museum in Kennebunkport, the Art Museum in Ogunquit (actually quite kid friendly), and the lighthouse in York. The beach was great - the tide goes out quite a bit, so there are a lot of shallows for beginning swmmers, albeit with a strong current. The water is cold, but it was in the 80s, so very refreshing.Crowded, but plenty of tourist infrastructure, which helps when traveling with both kids and senior citizens.
Downsides: traffic on Route 1 along the coast, the tiger mosquitoes have made it to Maine
We took our 4.5 year old to Old Orchard Beach, Maine and also spent a few days in Boothbay Harbor. Great trip.