Empty Beach At Resort
A lot of Okinawa resorts actually close their beaches (no swimming or walking allowed) over the winter. This one was open, but basically empty.
Crab Climbing Wall
iNaturalist suggests this is a Grapsus albolineatus - mottled lightfoot crab, or in Chinese it is 白紋方蟹. This particular crab has had a tough life - he is missing a lot of legs.