Acadia National Park in Maine is one of the most visited parks in the US, but there are still some less traveled places:

Besides the obvious Ocean Drive loop, there are some short hikes that are worth investigating – the sports stores in town have hiking guides, or check with the NP— there’s a trail that goes up a gorge on the back side of Cadillac that’s moderate [about 500’ in a mile or so] and very good for macro work – lichens, mosses, etc. [as is the viewpoint on top of Cadillac – everyone stares into the distance when the most amazing patterns appear on the exposed pink granite].

Or go out past Seawall [worth a stop] to Ship Harbor & Wonderland — these are popular but less crowded than the main road. Thuya gardens, near NE Harbor is lovely; most PFA [people from away] never get over to the backside of the Island — McKinley & Bernard are still picturesque , but actual working fishing villages, and you can visit the Bass Harbor lighthouse nearby.

 if you have more time, Schoodic Point is beautiful – wide granite ledges, looking across to Acadia. It’s a coupla miles down east [Maine talk for north] along the coast, a separate part of the Park.