I don't you book a 'seaview room' are these full seaview and at the front of the hotel or can they still be up the side?
There are seaview rooms at the front and partial seaview rooms at the side. Even if you don’t book a seaview room you should still be able to see the sea from the balcony.
Personally, we aren’t bothered about suing extra for a seaview as we don’t really spend time on the balcony
Get an answer from Hotel Riu Palace Tenerife staff and past guests.