Your wrong im pretty sure thats not in the law. As long as your 21 your good to go. Colorado 2013 here i come
Depending on how the DEA responds, it could be that only residents will be able to buy weed in CO, but more than likely anyone over 21 will be able to purchase it. In any case, shops won't be opening until at least January 2014, so look elsewhere for a vacation spot for 2013