Seawolf Park is located on Galveston's Pelican Island on a former immigration station site. The park offers one of the island's most popular fishing piers, picnic sites and a playground. The park is also home to tourist attractions, including the WWII submarine the USS Cavalla and one of only three destroyer escorts in the world, the USS Stewart. The remains of the tanker S.S. Selma, the largest concrete ship constructed, can be seen northwest of the park's fishing pier.