MATTAPOISETT — The Mattapoisett Recreation Department will be opening online sign-up for the Seahorse Summer Explorers program in two stages.

Sign-up for Mattapoisett residents opens April 1. Registration for non-residents begins April 5.

Seahorse Explorers is a weekly program running Monday through Friday for youngsters ages four to 12. Activities include games, sports, arts and crafts, tennis lessons, swimming and library visits. 

For more information, email mattrec@mattapoisett.net.