More than 5,000 fans jammed a Florida bar, its patio and the streets that surround it Sunday (March 3) as Kenny Chesney played a surprise acoustic show to warm up for his stadium tour, his camp reported online.

The report says fans were hanging in trees and crouching on nearby roofs around Hog's Breath bar in Key West, Fla., for the three-hour concert.

And while fans partied away, Kenny said he hadn't had a beer since Jan. 1 to get ready for his tour. He apologized for "needing to be a good boy—and this is the worst place in the world to do that."

Kenny's tour kicks off March 16 in Tampa., Fla.