I would stay out of 1501 if possible. As I stood on each patio and took view photos last trip 1501 not only had bushes right at the patio but the view toward the castle was looking right through the trees on the beach. Not a bad view but not as clear as some.
Here was my notes from looking at each view:
1518-3518 Has some small plants on the edge of the patio but do not block the view at all but the trees out on sunset point are surrounding the castle in the view but you can see the castle through them as well as fireworks and EWP.
1517-3517 have a clear view of the castle
1516-3516 have a clear view of the castle
1515-2515 look through many trees on the beach and garden area but 3515 may be up enough to see over these short trees.
1513-2513 is blocked by trees but 3513 may be up high enough to see over them
1512-3512 have a clear view of the castle
1511-3511 have a clear view to the castle
1510-2510 have a good view to the castle with some trees to the left
3510 may have more of the tree top blocking part of the view.
1509 looks at the castle through the tree trunks
2509 is blocked by more of the tree top
3509 may be high enough to be looking over the trees.
1508 is a good view through some trees. Not sure about 2508 and 2509 above it.
1507-3507 is a good view of the castle
1506 is a good view around some trees but the rooms above it (2506-3506) look blocked.
1505-3505 are good views of the castle
1504-3504 are good views of the castle with some trees to the left
1503-3505 are looking through trees
1502-3502 are looking through trees
1501-3501 are view through trees with the ground floor room having foliage next to the patio and partly in front of the patio.
This was just my observation.
Aloha
Steve