List four small islands that are located on coastal waters?

1. Mackinac Island, Michigan, USA: Mackinac Island is a small island located in the Straits of Mackinac, between Lake Michigan and Lake Huron. It's known for its historic architecture, limestone cliffs, and the famous Grand Hotel.

2. Isla Mujeres, Quintana Roo, Mexico: Isla Mujeres is a small island located just offshore from Cancun, Mexico. It's a popular tourist destination known for its beautiful beaches, clear waters, and snorkeling opportunities.

3. Capri, Italy: Capri is a small island located in the Tyrrhenian Sea, off the southern coast of Italy. It's known for its stunning scenery, including the famous Blue Grotto and the Faraglioni rock formations.

4. Koh Samui, Surat Thani, Thailand: Koh Samui is a small island located in the Gulf of Thailand. It's a popular tourist destination known for its beautiful beaches, coconut groves, and lively nightlife.