Some people do refeeds of as long as 48 hours -- if you do that, you should only be about 10-20% above maintence. I prefer going about 50% above for a shorter period of time (like 12 hours).
As for foods, dextrose is the very best, but really any starch will do pretty well also (assuming it does not have much fiber), because you will be consuming large quantities, so you will get a decent insulin spike.
My personal favorites on refeed days are cereal and spaghetti.