Lindsay Lohan just shot down a lucrative offer to do "Dancing with the Stars" ... because she doesn't want to do reality TV. The actress was made several offers to join the DWTS cast this upcoming season -- offers that maxed out at $550,000. But Lindsay -- who still owes hundreds of thousands in back taxes -- shut them down, telling friends she'd never consider doing reality TV ... she wants to stick to films. But there's one problem -- after "The Canyons" fiasco, she has nothing else on her plate.