Amazing vegetarian buffet three blocks from the Plaza 24 of September. The food was 49BOB a kilo in May 2014, rather high for Santa Cruz, but worth it. Lots of varied options, a huge salad bar, and a large assortment of drinks. Most of the food is vegan as well.
Like most restaurants of this type, it's good to arrive closer to lunch for a larger and fresher assortment of food, however this restaurant doesn't seem to run completely out by 2:45pm, like others do. Friendly staff and patrons too!
Like many places in Bolivia, the restaurant doesn't appear correctly on google maps, but it's right in centro.
Cons: Moderately priced