I like your idea to do some pictures of sea side, The coast with pine trees I can imagine why photographers like it, nice straight line of trees and the reflection in shallow water. The horse riders on the beach that is very good for horses, the ground is soft they really enjoy it.
The pictures of the rock and sunset, that is really highlight. It is wonderful that you made series of pictures, like the idea of the first with sun behind the rock, looks like the rock has a holy shine :)