Officials of the River Spirit Casino in Tulsa, Okla., say a 500-room hotel tower will be part of the casino's expansion. The building will include a Jimmy Buffett's Margaritaville Casino and Restaurant. "I'm excited about our partnership with Margaritaville. This is a great future for both groups. Our history in Indian Gaming and the experience Margaritaville will offer those who visit will make this a premier destination resort," Muscogee (Creek) Nation Principal Chief George Tiger said.