This lovely Greek island is touted as one of the least commercialised in Greece, offering the same crystal blue views and old-world charm as its more popular (and expensive) counterparts. Explore ancient ruins, bask in the sun on the white sandy beaches, or take it to the sea and snorkel, scuba dive, and windsurf.
Tip: You can score luxury accommodations with sparkling sea views (and some with private pools) for as little as £40 per night on Airbnb.