Oh so not a Disney Resort. I've never stayed off property so I don't know if they do that parkhopper passes there and if they don't you should be able to ask. I highly recommend getting those hoppers. You won't regret it and they last a long time. Say if you don't go to as many parks as you planned, you can reuse them years later. Or at least that's been the case in the past.
Like others have said get there when they open. I'm sure your kids won't have to be pried out of bed early on this trip. They'll wear themselves out then take a nap in the early afternoon, and back at it at night.
Other than that, enjoy your time there. I'm 23 and I love Disney, it's one of my favorite memories as a kid.