Make sure that you request lagoon view AND full balcony. I'm not sure how many of both there are.
I always call a few days in advance too, just to make sure the location note is still there. We always request an upper floor too. The rooms near the pool can be on the louder side, the further away you are, the more peaceful it is.
There is a quiet pool too, sometimes that is considered water view too.
From what I remember though, they changed the pricing scale and lagoon view has it's own price point now. I think there's water (pool) view, concierge (non lagoon view), lagoon view & concierge (lagoon view) in that pricing order. You might want to check it out in the online reservations. It was priced that way in December. This way maybe you only need to special request the balcony.