Whether you want to spend an hour or full day, you are almost one hundred percent gauranteed to find some sort of guided tour (Viator, TripAdvisor, etc.) available for your chosen destination. Additionally, if you are even traveling with a major tour company like Tauck, National Geographic Expeditions, Viking and others, there are in most cases smaller tours (excursions) within the larger travel itinary that you can enjoy. So grab a water bottle and explore the world even more.