Is West Village allowed to use the pool at River Island?

You have access to everything on site, regardless of which village you are staying at.

Yes you have full access to everywhere on grounds. So even if you stay in one village you can go all over with no problem. There is a free shuttle bus on grounds that runs every few minutes so if you don't have a car it is easy to get around.

According to the staff at the resort, the guests at West Village have full access to River Island's pool.