Park admission free. Stevens House $3; $1 (ages 5-18).
Park open daily 6 a.m.-10 p.m. (also 10 p.m.-midnight in developed areas). Longfellow House Visitor Center open Sat.-Sun. and holidays 10-8, Memorial Day-Labor Day. Stevens House open Sun. and holidays noon-4, Memorial Day to mid-Sept. Allow 45 minutes minimum.