Hi,
I believe you will have a good ocean view to the north, over the sundeck, though the tall beachfront building will block your view straight out and to the south.
Go to royalresorts.com and mexicondo.com, and compare the location on the map to the pictures on the sites. If you can see your balcony from the beach, then you can see the beach from the balcony

The home page of mexicondo.com has an arial picture of the Tri-Royals taken from the ocean. On that photo you can see the balcony just next to yours, and at a slightly different angle yours would show. The virtual reality on royalresorts.com should also help. You can see your terrace here:
http://mexicondo.com/RI_deck_party.jpg
http://mexicondo.com/Royal_Islander_02.jpg
Our RI unit that we got on eBay is just above the lobby behind the restaurant; we did the same thing when we were trying to figure out what view we'd get, and it turned out better than we thought it would.