I've stayed in the Hawaii longhouse on 4 different trips, with my 5th stay coming up in May!
I love the location of the Hawaii longhouse. It's located right along the beach of the Seven Seas Lagoon, and just a few steps from the volcano pool and children's water play area.
The north side of the building faces the lagoon and from my own perceptions, I would think that almost every single room on that side of the building would have a great view of the Magic Kingdom (unless there were some bushes partially blocking the view from the ground floor rooms). The rooms on this side of the building are called Lagoon View Club Level rooms, and it's a specific booking category.
The south side of the building faces the "quiet pool" and trees/grassy areas. Those are the Garden View Club Level rooms. These also are a specific booking category.
On BOTH sides of the Hawaii building the first floors all have patios, the second floors have only a wooden railing when you open the sliding glass doors, so you do get a full view, but there's no area to step out on to, and the third floor rooms all have balconies.
I have some health issues which effect my walking and stamina so the Hawaii building is the best choice for me because as already mentioned it's very close to the pool, and just a few more steps past the pool is the marina and boat dock that takes you directly to the Magic Kingdom. We don't even bother going to the Great Ceremonial House to catch the monorail to the MK because the boat is so close to our longhouse. If we're having a meal inside the GCH, then we do take the monorail, since we're already right there.
The walk to the TTC is a little longer from here than some of the other longhouses that are located at that end of the resort, but since my DH smokes, we always stop over at the smoking area at Tangaroa Terrace so he can have a quick cigarette before we continue on to the TTC and the Epcot Monorail. Having said that, I still don't think it's a very long walk at all. My estimate would be about 5-7 minutes at a normal pace. And the bonus is that you get to see more of the beautiful, lush grounds of the resort; there are so many tropical plants, flowering shrubs, and Hawaiian/tiki sculptures that it's really a treat to check it all out as you walk along.
We've always stayed on the Lagoon View side of the building, and it never fails to take my breath away the first time we enter our room and walk out on the balcony! On our next trip our DAunt will be with us and she'll be in a Garden View Club Level room so I'll be able to take some pictures of the view she'll have.
In the meantime, here are a couple of pictures of the views we've had in our Lagoon View rooms:
ROOM #3517(We were in this exact room on 2 of our trips)
Using the zoom on our camera:
Looking to your right is the Contemporary Resort:
Looking to your left is the Grand Floridian:
ROOM #3503 views
ROOM #3502 views
Taken from inside our room
Since most of my pictures of the insides of the rooms are already posted in this thread I won't bother to post them again. All of the rooms basically look the same on the inside, although the art hanging on the wall will vary.