Going out to Vegas for my 50th in May with some buddies and really thinking of going to Grand Canyon for the first time and wanted to see if anyone has done any of the tours. Leaning towards the one the Flys,copter and boat ride and takes 7.5 hours( gambling is important as we are only there for 4 days. Lol). Any info would be helpful and is the walkway a must do? The tour we are leaning towards does not have it but want to get away from a effing bus ride. Thanks