As is it possible read in the brochure of the hotels, the "quarantined", after 7 days can use swimming pool and fitness area and if on the beach, walk around the hotel for 1km....... this is the so-called "isolation"...
The process start at Thai Embassy in your Country. You must book and stay in a list waiting authorization to go (embassy provide for ticket flight). But only Γlite visa are allowed to entry in Thailand now. Maybe in october they could be able to change something when experimentally will open Pukhet to some tourists.