Hollywood Hotel is one of the best Disney Hotel I've ever stayed in. It is absolutely superb for its price. You will not be disappointed. I don't know if you could hold your trip for a tad longer, because The Iron Man Experience, an E-ticket attraction, is coming in the latter half of this year, and if you could put this into the current lineup of HKDL, it will greatly help due to the fact that HKDL suffers a little bit from not having too many big rides. Iron Man is definitely the hip one and the big one.
But if you can't, it will still feel the quality of the park is absolutely topnotch. It has very similar feel to DL in terms of overall architecture style and the castle. Everything is super clean and polish. Food are great with the flavor of Asia but nothing adventurous. About attractions, Lion King show is very different from the one in DAK and everything is plused up. It is a must see show. Space Mountain is basically the same to the DL's version. Jungle Cruise is the best version of all Disney versions with the addition of fire and water effects at the finale, it is also very different from other parks' that it circled the big river which in DL is the River of America. Therefore the HKDL version feels grander.
OK, now in terms of the new land that are not found everywhere else. Grizzly Gulch has my favorite ride in the park, the Grizzly Mine Train. It is so good in terms of landscaping, special effects, sound effects, AA, and overall thrill of the ride. Try the night version and do this one at least 2-3 times. It is a combination of EE and Big thunder Mountain but as far as I am concerned it is better than both of them in regards of its execution. The mystic point has the latest version of Haunted Mansion and it has some jaw dropping special effects. You will never find anything in any other disney park to compare with. It is a very unique attraction and certainly worth taking multiple times to absorb all the effects. This ride to me is second to Grizzly Mine Train only because I am not the big fan of the finale as well as that I find the general feel of the ride to be too kid-oriented. But it is still an E-ticket attraction because Mystic Point is such a beautiful mini land. Everything in this land is absolutely beautiful, from restaurant to the floor to the gift shops. This is a land that will transport you to other world.
Other than above, you should also do the Mickey's Philharmagic, which has a more adorable exterior than MK's. I havent' seen the new Mickey and the Wondrous book show but if time is allow you should watch that show too. At night, the Disney Paint the night show is a must see if you haven't seen the DL's version. It is the latest big addition to HKDL.
One final tip, I expect once Shanghai Disneyland open, HKDL will have light crowd. So you could do the three spin rides(dumbo, carousal, and tea cups) when you can't do it due to its long line in other Disney Park. I only experienced these spin rides successfully at HKDL and they still carry the charm of classic Disney. Therefore HKDL is the place to re-joy that simple fun and beauty of Disney Park.
Overall HKDL is a very beautiful park despite its shortlist of big rides. You will not disappointed.