We've booked 2 tours from Santa Cruz - Floreana Island Tour and Isabela island tour
Both tours took 2 hours one way and 2 hours back, so technically you'll spend 4 hours only for the road. It's very exhausted. It's better to go to Isabela island and stay there for several days and take the tours from the island directly to explore Isabela Island instead of taking a one-day tour from Santa Cruz.
About Florena Island - I also cannot say that I'd recommend Florena Island tour, again you'll spend 4 hours for a boat trip and 4 hours for the island directly. And all you can see there is a little farm with turtles and a snorkeling to see turtles under the water. Only local people leave there, and there is almost nothing to do for tourists.
I had a great time on all the tours I booked with Grupo Galápagos. The tours were affordable, and their team made everything easy so I could enjoy the experiences.
We had a great time - wonderful tour guides and we had a great time seeing Isabella Island and Santa Fe Island on day tours from Santa Cruz. We would highly recommend!