The two retreats that I have been to, you bring your own projects and supplies. I over planned and took several. There was a quilt shop nearby, walking trails, lake, and other activities to give you a break from quilting. Some of the things that I like best was that I made new friends and got to know friends better, learned new tricks, and that quilters would give their shirt off their back if you needed it. And you could sew until we hours of the night. The retreats that I went on we're only for the weekend and I would have preferred longer to add value of lugging all that stuff. And I didn't have to cook!
If you could go for a week, go you will enjoy yourself so much that you will be looking forward to next yer.