These photos were taken through a polarizing filter, which is a simple widget that improves your photos. The effect is most noticeable when you look at the sea in these photos: instead of looking washed out or like a sheet of white, it has a nice colour. Photos 1 and 2 show how a polarizing filter allows you to see what's under the surface of the rock pool, while in photos 3-5 the rock pools look more like they would without a polarizing filter.
Click here to learn how to improve your photos by using a polarizing filter.
All these photos are candid/unposed.