[happyjack]

only additional advice that i'd offer or emphasize is that you'd better plan, plan, PLAN this trip. disney has changed A LOT in the last 10 years and from everything that i've heard recently from families taking young kids for the first time is that you'd better have every day mapped out, and all of your "must" rides and meals reserved well in advance.

if you show up there these days without the reserved rides, it's highly likely that you wont be riding much of anything except the carousel and peter pan because everything books in advance...or you end up in a 3 hour line.

that said...5-6 year olds have decent energy but if you're there for a week, it's good to plan an off day, or a couple of off-afternoons where you just chill at the hotel pool and let the kid(s) decompress with some unstructured fun. the early excitement of walking into the park and seeing everything for the first time will wane by 300 - 400 in the afternoon. plan a later afternoon break back at the hotel and then schedule the time to be back in the park for a ride or two after sunset and to watch fireworks.

staying on a disney property does bring perks WRT meal plans and refillable drink cups, parking, shuttle buses, etc...for a first timer, it's definitely better to stay on the property.