In order, omitting duplicates:
Hard Rock Café (Vegas Phish 2003)
Comfort Inn (Vegas Phish 2004)
Rio
Mirage (Halloween)
Mandalay Bay (40th birthday)
Planet Hollywood (Conference)
Bellagio (Kentucky Derby 2009)
Palazzo (NCAA tourney 2010)
Flamingo (Super Bowl in 2012)
Planet Hollywood (NCAA tourney 2012)
Caeser's (2013, TR:
http://forumserver.twoplustwo.com/10...degen-1376801/)
Treasure Island (Kentucky Derby 2014)
Vdara (Upcoming trip, Dec. 11)
Speaking of suites, I didn't stay there but in 2006 I hung out with former Grateful Dead keyboardist Vince Welnick in one of the MGM two-story suites...