This isn't a half-bad place to spend a hot afternoon, especially now that Circus Circus, the casino/hotel that built this indoor amusement park, has undergone a face-lift. The glass dome that towers overhead lets in natural light, a solace to those of us who look peaked under the glow of the artificial kind. A double-loop roller coaster careens around the simulated Grand Canyon, and there's the requisite water flume, a laser-tag area, and a modest number of other rides for kids of all ages. A dinosaur-bone excavation area will provide a good time for preschoolers, and a place to rest for the supervising adults. Video games and an arcade are separate from the attractions, cutting down just a tad on the noise level. Jugglers and magicians provide impromptu entertainment. Our only suggestion is not to leave kids here alone; they could easily get lost.