15 free in-country airfare.
The promotion is valued at up to $410 per person.
The 10-day Amazon program travels aboard the 28-passenger riverboat La Amatista and focuses on nature, wildlife and local culture.
The 10-day Galápagos program marks Charles Darwin's 200th birthday with a visit to the destination that inspired his theory of evolution. It operates on the 32-passenger Evolution.
Per person prices for the Amazon start at $3,048 and for the Galápagos at $4,998, including the free in-country airfare.