Gwen,
Where my son was staying we had visitation similar to what you will have but there was no playground. The little ones there did not seem to notice that it's a jail...they were just happy to be there. There will be some stress for your kids no matter what you do. I agree with the others that it's best to have them come see you. It will help them have this contact, and to realize that although it's not the best place to be- they will see for themselves that you are okay. Plus, you _know_ how much it will mean to you to spend some time with them. I treasured the visits with my (grown) son and although I cried everytime after I left him.... those visits were pure gold. You are very fortunate to have such good visitation priviledges. I think it helps make the 'time' go faster. jmho