We just got back from a road trip and week-long camping trip with our little guy (including two 8 hour ferry rides). He likes riding in the car so maybe we have it easy but the thing that makes him most happy in the car is music. As long as we are playing his favourite CD's he's happy singing along (he's 22m).

Snacks for the car were really important too, though it was also important for us to stop and eat a few real meals, either packed picnic style or at restaurants. Our best snack items were a sippy cup of course, cheese and crackers, PB and honey sandwhich, pepperoni sticks (his favourite), cereal bars, dried apple slices, raisins, trail mix, and grapes.

We also packed a small bag full of his favourite toys and books, though in the car he just wanted his little toy motorcycle, his snacks and his music. He enjoyed stopping every few hours to run around and stretch his legs (we also had an umbrella stroller and a carrier with us so DH and I could continue to stretch ours after DS was done).

As for sleeping, most motels (well the ones here anyways)have portable cribs to lend. We never used them though as DS prefers to sleep with us so at hotels he just sleeps either between us or with me.

As for being homesick, I think for most toddlers, home is where their parents are so as long as you and your partner are there she should be fine. Bring sure to bring any favourite comfort items of hers though. We don't really stick to a strict schedule at our house so DS adapts pretty well to new situations, I'm not sure if a more scheduled toddler would be more upset at being away from home.

We had a really great time traveling with our little guy, I hope you guys have just as much fun on your trip with your little girl.