I have read in the archives that the Kuta Lagoon Pool is all one depth. Can someone tell me how deep it is. I may be taking my elderly mum (76yo) there in May, she can't swim and is a bit nervous around water. Would the pool be suitable? Also does anyone know what an upgrade to the Villa with private plunge pool would cost over and above the deluxe pool view rooms. Your help will assist me decide what I do. Thank you muchly.