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The city's main plaza, where locals and tourists alike gather to hang out and observe each other. There are benches and small tables to play chess at, there are numerous pidgeons to feed, and several cafes and restaurants surrounding it. The city's main cathedral is here and is quite beautiful. During the day you can pay to enter the cathedral's small museum and climb to the top of the belltower (Bs 3), where you can get a nice view of the plaza from above.
Of the Cathedral of Santa Cruz.
Zoológico Municipal
Not so big but quite pleasant zoo focused on South American animals. There is a food court and some kiosks inside. Many micros pass by the entrance, e.g. the one to Cotoca.
Go sloth "hunting" with your camera at the plaza of Cotoca and try if you can spot the 6ish sloths in the treetops without the help of the locals. Basically, they are high up in the trees, not moving and looking like a roundish part of the tree, but sometimes you can catch a face or their fingers. You probably will never see them move much, this is just the expectation you have from various documentaries about them, a slowly moving sloth.