As the name suggests, Mountain Travel Sobek made its name in trekking adventures. In fact, they pioneered organized travel to the Himalaya mountains some 40-plus years ago. These days, their repertoire has expanded to include kayaking in Alaska, snorkeling in Fiji, and a slew of safari destinations. But climbing excursion are still well-represented with guided hikes to Machu Picchu and Kilimanjaro, among others. Their other claim to fame is the high caliber of people attracted to the unique itineraries—so much so that you’ll be more than happy to spend time with fellow travelers well beyond the scheduled activities.