There's nothing like a cool dip in the water on a hot summer day! River access and swimming holes are located throughout the park on the South Fork and Main Stem Eel River. Bull Creek is also a great place to cool off by wading in the creek. Several swimming holes are located near day use areas, which makes it convenient to spend the whole day picnicking, swimming or just relaxing.

Hidden Springs and Burlington Campgrounds offer easy river access across the Avenue of the Giants. Albee Creek Campground has wading opportunities in Albee and Bull Creeks. California Federation of Women's Clubs Grove, Garden Club Grove, and Williams Grove are located along the Avenue and offer day use areas and convenient river access for swimming.

There are no lifeguards on duty at Humboldt Redwoods State Park. The Eel River is a natural body of water with a silt or rock bottom. Some areas that appear shallow may drop off sharply into deep pools. The river may appear calm in the summer, but there is often a strong current. Remember to respect the river and enjoy the water safely.