Matthews Beach is Seattle's largest freshwater bathing beach. It's open from 6 a.m.-10 p.m. everyday, and spans 22 beautiful acres along the Pontiac Bay.
The park includes a boat launch, a guarded beach, picnic sites, children's play areas, volleyball and basketball courts, restrooms, and plenty of hiking trails for the whole family to enjoy!
47.696202, -122.275068
http://www.tripleblaze.com/trail.php?c=3&i=6623