Put posts in the ground and attach trellises. Plant ivy and train it to grow up the trellises.
I would select CAREFULLY because you don't want a plant that will grow under the pool or cause problems for the pool itself/ attract bugs to be a skimming/ cleaning nightmare down the road (former "pool cleaner responsible" person here!)
Do you want a deck?
what exactly do you mean by surround? a deck? a privacy type enclosure? A covered area for shade?
We have pebbles around the edges of our pool. We used weed blocking fabric first to prevent grass from growing.