Surrounded as it is by water, Marathon is a great destination for people who love the ocean.
- Pigeon Key: This island is listed on the National Register of Historic Places. Initially a home base for those working on the Old Seven Mile Bridge, it now serves as a glimpse into the Keys' rich heritage.
- Dolphin Research Center: This nonprofit organization allows the public to learn firsthand about dolphins, with educational programs and interactive activities running throughout the day.
- Crane Point Museum & Nature Center: Combining a museum with a nature trail, Crane Point features a variety of activities, from admiring butterflies in the Butterfly Meadow to enjoying the breathtaking view of the Florida Bay past the point.