Off the top of my head, I can think of...
-a Turtlehead>Red Cap (might be a touch more than "easy class 3")>New Peak>Grey Cap>Kraft Mountain day would be physical and fun..(start at either Sandstone Quarry or Calico Basin);
-Juniper Peak and then Gunsight Notch Peak (from Pine Creek TH on the Red Rock Loop);
-less interesting, Summerlin Peak>Mount Woody>Mount Gottlieb...and you could even bag Cheyenne Mountain on the way out (start at the equestrian park at 215/Cliff Shadows Pkwy);
-out at Lake Mead, you could simply pick an area with a high concentration of peaks and ramble from summit to summit, all day long.
I'd be happy to show you around the 18th, except that I've already got plans in Zion. You're welcome to drive up to Zion and join us, if you're so inclined.