We just got back from there a couple weeks ago.
- Take a backpack - you'll need it (to carry your camera, your autograph books, bottles of water, extra clothes just in case)
- As soon as you get in, go to the FARTHEST side of the park...everyone seems to go to the areas to the immediate left and right of the entrance, and the lineups are crazy there...walk to the far end and there won't be as bad of lineups first thing
- Use FastPasses as much as possible...we didn't and we missed out on most of the parks because of it
- I think at City Hall you can get a list of where the characters will show up and at what times...get that if you're interested in meeting them...we missed out on several because we just didn't know where to look
- Take sunscreen (and include it in your backpack) and reapply it often
- If you can, take snacks in your backpack (told ya...you'll need a backpack, haha) because they are incredibly expensive there
- Don't do lunch/dinner at the usual lunch/dinner time...go for lunch at 2 and do rides while everyone else is having lunch...then you won't waste time waiting in line for your lunch either
- Try not to follow the crowd when you leave a ride...people tend to go from one ride to the one right next to it...so when you get off a ride, go to another ride, but not the one that the pack is leading you to...you'll have shorter lineups again
- For shows, parades and fireworks, get a spot at LEAST 1.5 hours early (though I'd go closer to 2 hours, I'm dead serious on this)...people start saving spots early and you'll have trouble finding a good spot to view them
- If you have to pick between parades, I TOTALLY recommend the Pixar Play Parade (at California Adventures)...we did it and Dreams Come True (at Disneyland) and Pixar Play Parade was a lot more energetic and fun (also, it was all the pixar/newer characters - Toy Story, Cars, Incredibles, Nemo...)
- Make sure to measure your kids before you go so you know which rides they can do beforehand...this will save you on tears from those that are too little but want to go on it anyway...(also, we measured DD and she was 42", but at the park, she was always 1" too short to do the 42" rides, so I think their measurement thingies are off just a little bit, just FYI)
- If you are going to do souveneir shopping, do it before the nightly parades/fireworks, because the shops get incredibly crowded from the time those events end until the parks close
- If you haven't already picked up a book about the parks and rides, I recommend that you do, and read up on each ride before hand...I had 3 of them and the best one I found was the Unofficial Guide To Disneyland (they do sell guides IN Disneyland in the shops, but they aren't as honest as this one was, which they obviously don't sell since it's "unofficial", lol)
- Take LOTS of photos, and have fun!!
If you want to know about specific rides and ages, I went with a large group of 10 with kids ages 4, 5, 7 and 10...so ask away and if we did it, I will let you know!
