I love the ID-Inside wrist bands. The come in pink or blue and are velcro. They hold little ID's inside.
I make mine on the computer and change them when vacationing. I have one made up for when we visit :
*Parks/Zoo's - basic information (parents name with cell #'s, and home phone #, plus Dr's #'s, etc...)
* Knoebels - with their phone #, camp site # (it never changes), and parents name with cell #'s, plus Dr's #'s, etc...
* Beach - name of motel and their phone #, parents name with cell #'s, and home phone #, plus Dr's #'s, etc... (we always stay at same motel)
* Florida - name of resort and their phone #, parents name with cell #'s, and home phone #, plus Dr's #'s, etc...
I also laminate the ID tags so there is no chance of them getting ruined. When we go on vacation or a trip, I just insert the appropriate strip and we're all set to go...