Banjo-Tooie Cheats

Banjo Rising in His Pack in Wumba's Wigwam
I'm not 100% this would work but it has happened when I played it. Use the split-up pads, use Banjo to go to Wumba's Wigwam, while there use the Sack Pack, go to the edge of Wumba's pool. This may take some time for it work. Eventually, Banjo will start to rise in the air in his pack until he reaches the ceiling. He will remain in the air as long as you're holding the Z-Button.