A group of people examine a boat with an orange flag that is sitting on sand next to a body of water.
People sit on a beach to tan.
The people can examine standing instead of sitting and they can be next to a river, ocean, not necessarily the beach.
We have no idea if they are on a beach to tan, they could be there for a number of reasosn.
People who are on a beach or next to water may not be there for the pupose to tan their bodies.