Taxis are designed to take you from point A to point B, and their licenses are for that purpose. Additionally, taxi drivers are not professional guides and may not provide you with accurate information. In case of any negative incidents, you may not have a proper point of contact, which can cause additional inconvenience. While taxis are the best way to get from one place to another, for tours and sightseeing trips, you should definitely contact a travel agency. Lastly, it is illegal for taxis to conduct tours, and both parties can be penalized.