Yikes! That is a bad position. My first suggestion is to see if you have family/ friends near by that you might be able to get to watch them- either at their house or yours. My parents live in Ohio and when I have to travel for business they meet me 1/2 way and they then keep my son while I am gone. Is this an option for you?
After that, I would try to use resources in your neighborhood and/or friends that you have made in the area. I would be really hesistant about hiring someone new to watch them for a whole weekend. That would be tough on you and tough on them.
Thirdly, is it an option for you to take them with you? You might then be able to hire someone within the resort/ hotel that could watch them for a couple of hours here and there.
My final suggestion would be to ask someone at your children's daycare to spend the weekend. Some day cares frown on this but if you explain your situation (and pay decent), I am sure that they will look the other way and accomodate you.
Good luck with this situation and please let me know if I can be of further help!
Kind regards,
N.