BirdWatching Provincetowns Beech Forest in the Cape Cod National Seashore (CCNS) is a national mecca for birders because it is a major resting stop for the semi annual shore and seabird migrations along the East Coast flyway.

Provincetowns geographical significance to this migration rests on the simple fact that it sticks forty miles out to sea. The birds know what the tourists need to know, there’s no place like Provincetown for a vacation.
http://www.nps.gov/caco
Trails in the National Seashore are perfect for a great walk and seeing some of the 250 species or birds and waterfowl found on Cape Cod.

Bird watching in Provincetown

For a truly fascinating and educational experience which can represent a vacation day investment at very little cost, the Audubon Wildlife Sanctuary in Wellfleet has 1,100 acres of wildlife preserve, self-guided and guided field walks and a large visitor center which includes exhibits and literature.
http://www.massaudubon.org/Nature_Connection/Sanctuaries/Wellfleet/index.php
Feeding wild chickadees