If you have 2 adults going, I would take both. We did this, and doubled our chances of getting a good shot when the kids were with the characters. When we got home, I downloaded approx 300 pics to the computer, deleted the memory card, and the computer promptly crashed and died. My film pics were all I had! Thankfully DH found an undelete program at work, which restored maybe 2/3 of my pics, but at least we have the ones from my camera to fill in the gaps. I also use my 35mm for the pool, because my digital is too expensive to risk.
BTW... a box of 5 rolls Kodak film is $8 at Wal-mart, and you can develop it for less than $4/roll for single pics there. Minimal expense IMO compared to the cost of the trip, and the value of the memories.