i have 4 kids, and we usually bring disney themed toys with us to the parks. for instance, at the
disney store, you'll find toy cameras, toy flip phones, toy hand-held fans, etc., all with different disney characters on them. also, there are the light-up spinney toys that are great at night.
anyway, we bring a backpack with lots of those little things in them, and those have helped us keep little hands (and minds) busy while in line.
also, we always are sure to have snacks and drinks handy. little bags of goldfish crackers, granola bars, apples (maybe you could dry some in the dehydrator before vacation, those are always a hit!), and cold drinks.
i
HATE giving my kids hard candy, but you'd be amazed how much peace a lollipop can afford you in line, lol. especially those spinning ones....it's a toy and candy all in one. pez could serve the same purpose...there are several different types of candy dispenser type toys...if you check somewhere like toys'r'us ahead of time.
i've even brought little bitty notebooks and pens/pencils because my kids like to doodle and that keeps them occuppied. we don't have to bring this type of thing out much anymore, as my youngest is now 4, and we work really hard to avoid long lines (RideMax and FP's). the things i got the best results out of over the years though, were lollipops (they sell them in disney character shapes in bundles, like 6 for $4 or something, in most of the shops), the hand-held fans, and the light-up spinney toys. the toy flip phones keep them pretty busy as well (they sell them at wal-mart for about $3, and they say different phrases and the buttons make noises....they have better ones, more variety, at the disney store for about $5 each).
good luck, and have fun!!