The most amazing place we went to in Samoa has to be the To Sua Trench. It literally means 'full'. The trench is a sea-fed cave in the ground... one with a giant ladder to reach the pool below.
The swimming was amazing.
The pool was deep, and clear, and simply mind blowing. We could snorkel and watch tiny fish, or just swim, or jump into the water from the platform. I spent time exploring the cave leading to the empty trench.
The whole complex was well maintained, and to their credit, well organised.
There was also a sampling of all the wonders Samoa has to offer, from lava fields, to blow holes, to a private beach, tropical plants, and in a pleasant turn of events, a kiosk that sold cold water! Bliss.
We even saw bats flying around the trees.
I would go back in a heartbeat.