 Presque Isle State Park / <unk> / is a 3 @,@ 112 @-@ acre ( 1 @,@ 259 ha ) Pennsylvania state park on an arching , sandy peninsula that juts into Lake Erie , 4 miles ( 6 km ) west of the city of Erie , in Millcreek Township , Erie County , Pennsylvania , in the United States . The peninsula sweeps northeastward , surrounding Presque Isle Bay along the park 's southern coast . It has 13 miles ( 21 km ) of roads , 21 miles ( 34 km ) of recreational trails , 13 beaches for swimming , and a marina . Popular activities at the park include swimming , boating , hiking , biking , and birdwatching . 
