Dolphin Βoat rentals offers motorboats for hire and is located in Limni Keri (Keri Lake), just besides the beach.
From here you can visit the famous Keri blue caves and Marathonisi island.
Minimum duration for hiring a boat is 1 hour, while the maximum is all day long.
You can also choose to drive alone and if it happens to need help there is always a a guard in Marathonisi island to ask for! Enjoy your boat trip!