All Points Island is where Mermaids and Humans live together in harmony. People live on land, and mermaids in water. The Windsnaps were a slightly unique case, because they were a couple of a human and a Merman, and they had a daughter who was both. They lived in a half-sunken boat, that had been remodled on the inside to be a modern house. The top half was designed for people, and then trap doors were all around the house/boat that lead to the lower half, which was designed for merfolk. The trap doors made it easy for the family to converse with each other, and for Emily to reach her Father's way of living.
All point Island is described as a beach with soft and clean-white sand, unlike Brightport, where the sand is 'dirty beige'. The palm trees are described, 'palm trees that reach lazily out from the beaches.', in the second book. (Emily Windsnap and the Monster from the Deep.) The ocean is a beautiful turquoise color, it states that it shines/glitters in the sunlight.
the lagoon is in the south east corner of the island. It is a lovely place with tropical plants and flamingoes. However, people and merfolk were cationed never to enter, for just past the lagoon, lay the Kraken's cave, where it slumbers.