The operative word is QUILT, not Guilt. Take several of the "need to finish", a couple "ought to finish" and several "want to start" things. You'll have far more than you can possibly get done but you won't get bored or burnt out because you can always switch off. Take at least 2 times more projects that you could get done if you sewed for 24 hours a day. That way you'll have plenty to choose from. Also take a few extra large scrap fabrics so that if someone is using some technique you want to learn you can stop your project and make a block of what they're doing for future reference.
At least that's what I do when I go to a retreat and I've never been the least bit disappointed.