Hong Kong
Disneyland will feel a lot smaller than DLR and WDW. I understand that it is the smallest of all Disney parks anywhere in the world.
With two half days, you'll probably be able to fit everything in. Fantasyland isn't that big. There's Dumbo, IaSW, Mickey's Philharmagic, the Carousel, Winnie-the-Pooh, the teacups and the Golden Mickeys (live show). Your kids will probably do all of those.
There are 3 rides at Toy Story Land. The RC Racer is probably the coaster in the lot; and the parachute drop might be something that your kids might choose not to do. But Slinky is very gentle.
I would do the Jungle Cruise. There are 3 queues for the Jungle Cruise - English, Cantonese or Mandarin. You'll probably pick the English line.....be aware that you might not be able to understand the captain. I found my captain's accent to be rather strong and as the PA system wasn't that great, it made things quite difficult to understand. But there is an extra section of the waterway towards the end of the Cruise. It is a little bit different to WDW and DLR.
Tarzan's treehouse would be another great attraction for the kids. It's located on an island (there is no Tom Sawyer equivalent) and you catch the rafts out to the treehouse.
Will your kids want to see the Lion King show?
Your kids may well like Tomorrowland best. Autopia, Buzz lightyear astro blasters, the Orbitron might appeal. Check out the Stitch live show. They run shows in English and Chinese; so you'll need to work out when the English shows are and come back for it. They alternate between the languages every hour or so. It is a cute interactive show for kids.
When I was there, Grizzly Gulch had not opened so I can't tell you anything about it. Mystic Manor is due to open around the time that you are there.
So.....aside from the excellent Parade and the fireworks, I figure you could get all that done in the two 1/2 days.
If you are staying at the Disneyland resorts, then it will be quick and easy to get back to the park if you wanted to.