Go all over (4)
(Other definitions for tour that I've seen before include "Short trip; spell of duty" , "A trip round" , "Journey around" , "Travel round" , "Visit a number of places" .)
(Other definitions for gad that I've seen before include "wandering about" , "Walk (about)" , "old Israelite territory" , "country of old" , "carefree adventure" .)