37 people on the tour - far too many to be safe or to have a satisfactory experience. 3 tested positive for Covid before flight home. 2 of the 6 of us traveling together were positive upon arrival. Mask encouragement and enforcement was non-existent (except by museum staff) and tour leaders were amongst those choosing not to wear/wear their mask properly. Activity level and distances were underestimated. Despite early wake up times, tours were crowded and the outside of Athens experiences were scheduled for the hottest part of the day. This was my first and likely last experience with SmarTours.