A jewel of the National Park system, Cape Cod National Seashore hosts two visitor centers on the Cape, in Eastham and Provincetown. Both include wonderful visitor buildings that lay out the ecology of the region, and are staffed with rangers who lead tours and are there to answer questions about the park. Both centers are situated on large swaths of protected lands replete
50 Nauset Rd., Eastham
Phone:- 508-255-3421
Wellfleet Bay Wildlife Sanctuary Wellfleet Bay provides over 1000 acres of peace and unmatched beauty on the hillsides and shoreline overlooking Wellfleet Harbor.  Five miles of trails bring you to a panoramic salt marsh, sandy barrier beach, and pine woodlands, attracting a wide array of wildlife.  The sanctuary features a universally accessible trail and an award-winning “green” nature center with numerous exhibits and aquariums.  Wellfleet Bay offers a variety of fun, educational family programs, including tidal flats explorations, turtle prowls, and nature themed boat cruises. 
291 Route 6, South Wellfleet
Monomoy Island Excursions Enjoy an 1.5-hour seal tour around Monomoy Island, home to thousands of seals. A trained naturalist narrates the tour, discussing the seals and plentiful wildlife of Monomoy Island. Beyond the seals and birdlife, you will also have the chance to see Wychmere Harbor in Harwichport, Stage Harbor and the picturesque shoreline.
702 Rt. 28, Harwichport
Phone:- 508-430-7772
The Center for Coastal Studies specializes in Marine Mammal Research and Rescue, Marine Fishery Research, Marine Estuarine and Studies and Marine Education. They have various events and field walks every week. Experience the natural wonders of Cape Cod at the Sea Space Marine Discovery Center
267 Commercial Street, Provincetown
Blue Claw Boat Tours Enjoy a 90 minute seal cruise adventure Orleans through Pleasant Bay to the beach break in Chatham! View the seals in their natural habitat, as they swim and play!
69 Barley Neck Rd. Orleans
Phone:- 508-240-5783
Beachcomber Seal Tours Join the Beachcomber Seal Tours for a fantastic 1.5 hour cruise around Chatham. See the many seals that live around the Chatham Harbor waterways- between North  Beach, Chatham Lighta and the Break. 31 person capacity.
174 Crowell Rd, North Chatham
Phone:- 508-945-5265
Visit Website https://sealwatch.com/