One day is not enough. Yes indeed, a one day tour would most likely leave you wanting for more. The place wakes up the child in you. From the time you enter the magical place till the time you'll step out, the place will leave a lasting imprint in your memoirs.
If you are a backpacker and decided to stay in a hostel somewhere in the heart of HongKong, I suggest you take the MTR, better make sure that you have an octopus card with you as it will save you all the hassle. A series of train rides can be very enjoying. Just make sure you have the MTR Map with you so that you'll know which train to ride. If you are located in Kowloon, ride the MTR going to Central in Hongkong Island then from there, go aboard the connection station toward Sunny Bay and there awaits the Disneyland train station, very nice train I must say. The features will really make you say "Disneyland, Here I come!". But if you want more adventure, then might as well try the doubledecker bus going to central then ride the ferry towards disneyland but this will take a while so I prefer the subway as this is not confusing especially if you have just visited HongKong for the first time.
So you are already in Hongkong Disneyland, the moment you enter, the left side of the promenade is the entrance to the park. The center of the Park is Sleeping Beauty Castle where most events happen like the Highschool Musical Moving theather will perform and of course the much awaited big firecracker display in the evening.
We haven't really explored everything but I must say there is one place I love the most in Hongkong disneyland and it is the boat ride toward the small world. It is situated besides Alice in Wonderland's giant tea cup and saucer ride. You will see a giant clock and you will have to follow a long trail before you get to the boat ride inside the building where the giant clock is. But the wait and travel is worth it because the moment you enter the small world, you'll see the best surprise ever. Imagine all countries unite with just one song, all cultures depicted, it is like travelling around the world in a small mechanical boat.
The only thing I find challenging in Disneyland Hongkong is the heat. Shades are very rare, you'd have to get inside the souvenier shops to have one but I guess that's a marketing strategy hahaha.
Also for a themepark, it seems that the rides are for small children what about the child at heart who wants real time adventure in the best known theme park in the world? Add a zipline maybe or a gigantic roller coaster that really goes fast, will you? That should make the place really swell.