Pretty neat place. The tour is free and us self guided; you walk about 150 yards along the production line; when we went they were producing a small batch for Valentine's Day. It's pretty neat and takes about 5 minutes; the tour ends with a small free sample and entry to their chocolate shop, where we were blown away by their prices... In a bad way... $48 boxes of chocolates and $35 boxes of pecan brittle...
The cactus garden was very neat as well. This is a good stop on your way back to Vegas from the Hoover Dam.