G Adventures has further extended its suspension of all tours until the end of August due to coronavirus.
All tours due to depart before 31 August have been cancelled, the operator confirmed late on Thursday (25 June).
Guests can rebook for a future departure, or switch their booking to a different tour.
They can also cancel and rebook for closer to time of departure "for flexibility and peace of mind".
"All travellers booked and fully paid on a tour departing prior to August 31 2020 will receive a 110% credit on tour services, including pre- and post-night accommodation and transfers – excluding airfare and insurance – to be used within the next two years," said G.