that is a good point about tourist destinations - especially if the travel plans on made in the off season - like Vegas in the summer, phoenix in the summer, minneapolis/Chicago in the winter, etc.
one thing to think about would be when to do it - school year is hard because of kids in school, but then it is also hard in the summer because they aren't in school (speaking from the point of view of a stay at home mom of a 1st and 2nd grader!)!
also where are retreat centers located?