Any suggestions? IMO, The Offspring should do a like U.S. tour with a band together like they did the past, especially when they were supporting Smash, Ixnay and some of their later releases.

In my opinion, I'd say they should tour with one of these bands/artists:
Big Drill Car (if they plan to stay reunited fulltime)
Bad Religion (now that would be a killer tour)
Rise Against
Rancid
Flobots
Pennywise
Social Distortion
NOFX
Weezer
AC/DC
Metallica
Rage Against the Machine (if they plan to stay reunited fulltime as well)
Snoop Dogg (although he's touring 311)
Pepper
Afroman
Matisyahu
Jack Johnson
Down (a project of former Pantera singer Phil Anselmo)