remember to give him some time off on his own and away from you each day.....three to four hours each day......you've met this guy before, right??!!
Red Rock canyon area is nice (small fee to go on the scenic drive)....walk the strip and people watch in the evening......all the other suggestions are very good (Hoover, Grand Canyon West)......if you drive out to Hoover, there is some new highway construction near Boulder City and at the dam area.....follow signs toward the dam itself and don't forget to walk out on the bridge at the pedestrian plaza area.......
you can also ask your hotel concierge for ideas, though they may get a cut of the action