You can take a quick day trip to nearby islands like Spetses, Hydra or Aegina by ferry. FerryHopper.com is great for researching costs, schedules, and purchasing tickets in advance. You can travel by ferry from Athens to further beautiful islands of the Aegean Sea, such as Santorini, Mykonos, Milos, Naxos, Paros, Rhodes, Crete, and many more! **Some of these trips can take up to 5 hours by ferry. Although ferry rides are beautiful, we recommend looking into flights if you want to be more efficient (some islands can only be accessed by ferry).