I had a very hard time letting my kids ages 6 and 7 go half way across the world to Maldives without me. I didn't think that this would be so hard for me since they would be with my brother who takes excellent care of them. Until I knew they landed in Maldives I was completely stressed, worried and anxious.
I created a Manual for my parents so that they knew what to do with the kids while they were with them... I think it helped but I got teased a lot for worrying too much :) The manual includes directions for what they should do every day which might have been a little excessive. Here is a copy of what I put in there: