Those are carriers, not tour companies. Search for group tours on Google, there will be many actual tour companies there.

Depends on what exactly you want to get from it. You can go with them — it’ll be cheap, quality depends on luck. You can go with companies that have g...

With a driver or a tour.

In good weather you can see it from many places: even at the airport itself and along the road to/from it. From the Cascade, from Akhtanak Park, Tsits...