On a Friday in April, the lines for Space Mountain and Thunder Valley did not exceed 10 minutes all day. Astro Blasters twice had 4 people in line. The price is $60, which is ~$30 cheaper than Anaheim.
It was about 80 degrees during the day and 70 at night. Also when you exit Disneyland HK you are in Hong Kong, which is much nicer than Orange County, but maybe not for dim sum. You can take the metro from downtown and get there in under 45 minutes.
There are analogues for most rides in Disneyland, noticeable absences are Indiana Jones and Pirates of the Caribbean.
Big draws are the character shows, Winnie the Pooh, and Fantasyland, so if you’re not really interested in those you are in lots of luck.
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