The phrase "on a group tour" refers to being part of an organized travel experience where individuals or groups are accompanied by a guide, tour operator, or other form of leadership. This type of trip typically involves visiting multiple destinations and may include activities such as sightseeing, cultural experiences, adventure sports, or educational opportunities. Group tours can range in size from small, intimate groups to large bus tours with dozens or even hundreds of participants. The phrase is often used when describing travel experiences where individuals are not traveling independently but rather as part of a larger group led by an experienced guide or tour operator.