From some room tours I viewed on YouTube, not all Y5 Triple rooms face outside. There are 4 rows of Y5 Triple:
↑ Towards Y5 Double Rooms ↑ Towards Y5 Double Rooms ↑ Towards Y5 Double Rooms ↑
Mountain | Row 1 | Corridor | Row 2 | (seeing each other) | Row 3 | Corridor | Row 4 | Hostel/GG
Lift Lobby
If your Row 4 room is high enough to not being blocked by staff hostel, you get to see Genting Grand and Theme Park.
Without paying extra to choose view upon check-in, securing Y5 Triple doesn't guarantee what you see outside. In my last visit staying at FWH Standard Double, all add-on options were greyed out. Probably checked in too late until good rooms fully snapped.