1. Tours with this activity level involve walking over relatively level terrain, possibly some cobblestone, gravel, or a few steps. Comfortable shoes are recommended.

  2. Tours with this activity level involve a considerable amount of physical activity such as substantial walking over cobblestone streets, uneven or steep terrain, climbing stairs, or extended periods of standing. Not recommended for guests with physical limitations. Comfortable, sturdy shoes are recommended.

  3. Tours with this activity level involve physical exertion for extended periods of time; can involve uneven or steep terrain or swimming in a light current. Recommended only for physically fit and adventurous travelers.