DS was invited to RISE last year, but we already had travel plans and he didn't go. I talked to some that did and they spoke very highly of it. Attending does not commit you to any added responsibilities during the year and it is a great opportunity if you chose to go. For us, it meant he would have to give up his last couple of days with the family and he elected not to. He did use the time just before R-day to get to know some of his classmates which is essentially one of the benefits of attending RISE.
Bottom line, if you choose to attend, you will be glad you did, but don't sweat it if you'd rather not.