how many days shall i stay at Hong Kong Disneyland?

Even though I've haven't been there, I advice you to stay for a maximum of 2 nights. The hotels should be big. Both hotels are like luxury though. The rates are here:
http://park.hongkongdisneyland.com/hkdl/en_US/hotels/listing?name=HongKongDisneylandHotelRatesPage
It will be fun on the first day, but of course you can go somewhere else. Tokyo Disneyland, I think is similar. I've been there when I was er... 3 years old?
No matter what you want, wish you a fun trip!

Japan Disneyland more nicer then Hong Kong

HK disneyland is the smallest around the world. so, 1 day is pretty enuf. they do not hv 2-3 days pass for visitors. admission for an adult wil be HK$295 - $350 depends on the day (peak or non peak).

closer hotel to Disney wil be their own hotels..... the HK Disneyland Hotel / the Hollywood Hotel. chk out the room rate here....
http://park.hongkongdisneyland.com/hkdl/en_US/hotels/landing?name=HongKongDisneylandHotelLandingPage

re: Tokyo Disney.....mmmm..... it's largest than HK of cos but my personal opinion... they hv 2 much Japanese elements added into the park which made it not v alike the one in the US. and everything so expensive in japan!!

um..you can probably cover hong kong disneyland in about a day because its bot that big. you should go to tokyo disneyland instead=]

2 days

Hong Kong Disneyland opened on September 12, 2005. It is on Lantau Island and may be reached via the MTR Disneyland Resort Line from Sunny Bay Station. (Note that, to get to Disneyland from the HK Airport, you must make two connections, the first at Tsing Yi and the second at Sunny Bay.) Though significantly smaller in size than other Disney parks elsewhere, it does offer some great attractions ("Festival of the Lion King" stage show, "Golden Mickey's" stage show, "Mickey's PhilharMagic 3D" show) and very short queues most of the year (except the week of Chinese New Year). Disneyland has not been as successful as anticipated and reports in the South China News indicate that it has failed to reach its visitor numbers by as much as one million people. It's not all bad, though - a second theme park should open next door in the near future.

Ocean Park is on the southern side of Hong Kong island. With roller coasters and large aquarium altogether, it's still packed on weekends with families and tourists after opening to the public for 30 years. The cablecar is an icon and an essential link between the two parts of the park. The views of the South China Sea from the car is always terrific. It would be fair to say that many local people would choose Ocean Park if they had to pick a single theme park to attend. For many, the chance to see Hong Kong's pandas would be a deciding factor. Young adults will be attracted to the wider range of rides. You can get to Ocean Park by a direct bus ride from Admiralty MTR station; it will be the first stop after you clear the Aberdeen Tunnel.

Hong Kong Disneyland is so small that you can finish it within one day, so I wouldn't spend more than 1 day there.

I would recommend the Tokyo Disneyland instead, because there's both the Disneyland and Disney Sea, which you can easily spend 2 days there.

er...i think about a night or 2. it's not a fun place for adults but since with your kids. how old are they? well i was 12 when i went there and it was pretty boring for me....
the hotels are pretty nice .

Hong Kong Disneyland is not big actually and you can spend about 1-2 days is enough for most part. The tkt cost around HK$350 (US$45.45) for peak period and HK$295 (US$38.31) for off-peak season and approx half-price for child 3-11. No the tkt is only for 1 day and you have to purchase seperately if you want to visit 2 or 3 days, which is not worth it. There are two hotels inside, but both are expensive, so if you want you can stay elsewhere if you want to visit HK as a whole, or else, HK Hollywood Hotel is cheaper for HK$1.200 for special rate and HK$1,400 for normal discount rate. Its depends and if I were you, I will 100% visit Tokyo Disneyland and/or Disneysea and not HK Disneyland as is bigger and 100% more fun. But its really up to your call to decide. Anyway have fun with the Mickey and Friend wherever you decided to go. Enjoy !!!