For over 45 years, Frontiers has created bespoke itineraries for adventurous travelers desiring private, action-packed activities during the day and top-of-the-line accommodations at night. The company’s latest excursion, the Ultimate New Zealand Luxury Adventure + Hawaii, is a 44-day tour that promises an intimate overview of the islands’ most well-known vistas and their more hidden treasures.

Kicking off with 35 days in New Zealand, the expedition includes white-water rafting down the North Island’s Rangi…