Great thread - lots of info! We stayed in a cabin this summer and it was AWESOME!! You're gonna love the Fort!
Okay, there are a lot of posts here, but here's what strikes me:
Carts: Listen to Frank - if you're doing mostly parks then save your money for something else. Internal bus system is great - also you can easily walk to Meadows if you're in loop 2100 or 2200.
Kids: Take lots of drinks/snacks to the parks - we went in July and took an insulated lunch box full of Capri Sun and individual fruit packs every day.
Walmart has these handy cold packs for $1 a piece that don't take up much space and will cool something small like that just fine. Also, get lots of those travel packs of anti-bacterial handi-wipes.
Kids: Respect the naptime. There were a couple of days that our DD didn't go to sleep, but we got her comfy and in the bed to waller (did I spell that right?

) around for a while and relax. Totally makes the difference. Don't let you kid get tired or hungry and you should be fine. They aren't really concerned with being hot/wet/cold/dirty, etc.
Oh, there was something else. The fridge & cups - oh yes - stock up on drinks and plastic cups. The water tastes icky so get bottled water or gallon jugs. Coffee - there are two pots - I believe both use regular filters - one is a little 4 cupper, the other is regular size.
Last thing, then I'll shut up, when you are in for the night... bring in your stroller and clean it up and "reload" for the next day (except cold stuff). It'll save you some headache in the morning.