I am planning on renting bikes for me/hubby and 6 year old can i just leave my 4 year old with the club on catstaway ? can I check my 6 year old out then bring him back when we are done so we can enjoy soem adult time or do I have to keep him with us once i check him out or if i decide to wait to check him in after the bikes can i or do i have to sign up for him to do the kids club on nthe island??? Thanks for your help yu guys (sorry about misspelled words I am always typing on the fly.....)