I think that the page which emcampbe might be referring to is:

https://www.united.com/web/en-US/con...averaward.aspx

although it doesn't provide a whole lot of specificity.

As far as destinations go, perhaps a ski town in the mountains is a consideration? It's not a non-stop flight on UA at this point (UX connection in Denver), but ski season is mostly over, so perhaps there is award availability, and a place like Aspen is always fun (you didn't say anything about $$$$)....