Disney Advice??

Ok, we'll we're heading off to Disney World soon for the first time with the girls. Brent and I actually got engaged there and we're sooooooooooooo excited. Lana is going to go nuts (as you can tell by her Cinderella obsession). Nana and Pop are coming too so we should be good with 4 adults to two kids (one who's still not walking, thankfully!). We're staying on-property and have a meal plan and all, but does anyone have any great tips for us? Anything we should make sure not to miss? Would just love to hear ideas and recommendations!