@roger,
Ah, well if that is the case, working as a traveling nurse, my brother did this for a while and loved it. I am not familar with agencies that run - you could always do an internet search to see if you can find feedback on an agency.
Do you know where you would like to go? Some places that are popular, but in the cooler months (when seniors move to warm climates) - Florida and Arizona. My brother worked in both. He also worked in San Diego and San Francisco. I think some of the problems are you might be assigned a hospital that you may not like how they do things - that happened to my brother in Florida. The one nice thing is - you are working for x number of months and then you can move on.