As far as I can remember, Regent didn't offer anything at the end of LLAMA. We arranged a tour that we did with the Byrnes using a guide recommended by Fred. However, the guide moved from the area. In fact, we used the guide for our tour the first day in Rio also, and it was great. The second day we went to Petropolis, which I'd highly recommend if you've already seen the sights of Rio.
We dropped our luggage off at the airport before going on the all-day tour. But you need cash to leave your bags at the baggage check and because we didn't have enough, we went to an ATM and that is where both the Brynes and we were subject to identity theft. I've written about that before, so no need to go into it. No problem as long as you stay away from the ATM machines.
Marc, I don't think you get a thorough enough tour through H. Stern, but others can chime in.
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Eugene