Whale- & Dolphin-Watching on the Mid-Atlantic: The Atlantic coast of Maryland and Delaware, particularly near Cape Henlopen State Park (Del.), is a good place to spot whales and dolphins. The Great Dune at Cape Henlopen is a perfect vantage point (bring binoculars). There are also whale- and dolphin-watching cruises available -- even sea kayaking with the dolphins.
Bombay Hook National Wildlife Refuge (Central Del.): The largest of Delaware's wildlife refuges, Bombay Hook, northeast of Dover, has nearly 16,000 acres of tidal marsh, freshwater pools, and timbered swamps. You'll see a lot of migratory waterfowl in fall and spring; then the migrant shorebirds and songbirds appear in April, May, and June.
Note: This information was accurate when it was published, but can change without notice. Please be sure to confirm all rates and details directly with the companies in question before planning your trip.