Go to the Beach. South Haven has two main beaches, the North Beach and South Beach. Both are directly adjacent to the piers. The South Beach is known as a more family beach, while the North Beach is the favorite of students, especially from Western Michigan University. There are other beaches too, drive along North Shore Drive and there are a number of street ends and small trails leading to public beach accesses.
Fishing - in early spring, around late March and April, salmon and lake trout are running and can be caught from the piers. Some people like to use flashing spoons and some like deep diving Rapalas. Spawn bags also work well. Other times of the year, people still fish, there are perch, bass and other fish taken from the piers and various fishing sites upstream as well.
Harborwalk - there is a sidewalk route that will take you from the South Pier at the South Beach, along Riverfront Park and the harbor, through the downtown, across the Bascule Bridge, past the Maritime Museum and the marinas, and out to North Beach and the North Pier.
Pick Blueberries - there are a number of blueberry farms in the area where you can pick your own blueberries and eat lots while you pick. You can also get a quart or two at the farmers market, or a number of roadside stands.
Ride the Kal-Haven Bicycle Trail - the Kal-Haven Trail is a rails to trails bike path linking Kalamazoo and South Haven. If you don't want to ride the full 40 some miles, ride just a ways out of town to the covered bridge and the overlook of the north and south branches of the Black River. A trail pass is required.