Blue Painter's Tape (to tape all the drawers shut for our little cruiser, as well as tape hotel washcloths to corners of tables)
Power outlet covers (4-6 of them)
extra sticky things for the tub so the toddler doesn't slip.
Papa made a nest for the toddlers sleeping quarters... I tweeted about it. It was awesome. We used the bedcovers (because they aren't very clean) to pad the bottom. Then we used, some extra hotel blankets and finally a new set of clean hotel sheets. Myles brought her blanket and her own pillow and the nest had a ring of hotel pillows around it. At the foot of the bed was Emmy's travel bed (basically a folding drawer) and we made that cozy for her. All of this stuff was on the floor so that Papa and I could sleep and not worry about them falling off the bed.
Anyway, we did alright otherwise, but we would have had an easier time if we had brought the stuff. I am definitely bringing it on our road trip because that will be all motels.
The trip was great, we saw the Long Beach Aquarium and had a great time with family. We stayed completely under budget, so we can definitely do this again! =)