For groups, there are three optional tours.

The only extra costs are for optional tours, like the rain forest canopy ride, which is $50 a person.

There is an optional tour to Inca sites.

The optional tour of the Wachau Valley will leave from the hotel and will be free to all passengers.

It is owned by Holland America and the sites lists a number of optional tours that can be scheduled before or after your cruise.

The only charge is $2 for an optional tour of historic private homes and gardens nearby.

The stops at Katherine and Alice Springs allow time for optional tours.

Admission: $12, which includes optional tours of several historic houses in Salem.

Groups are in the country for one to two weeks participating in various service opportunities and optional cultural tours.

An optional half-day tour of the city, which includes a visit to the Coliseum, is available to help you get your bearings.