How do you get rid of wrinkly belly?

Okay...post pregnancy. But we're talking 20 years after the fact. It's not super bad, but I want a smooth belly. I'm a avid biker, I've tried collagen lotion, loofas and diet. Is abdominoplasty my only option? In the meantime, anything that can help hide this? Tanning? Self-tanners? Help! Thanks--