Please choose the correct ending to complete the given sentence: Travel: [header] How to go on an expedition cruise [title] Contact an expedition cruise line. [step] These companies specialize in delivering the sort of stripped-down adventure opportunity you're after. There are several notable cruise lines to choose from, including linblad expeditions, innersea discoveries and silversea, who specialize in a hybrid luxury and excursion brand of ocean travel.

Ending1: [title] Order itinerary referrals. [step] Observe how people intercorporate cruise companies into their travel log. Ending2: [substeps] Be wary of quick-paced cruises. They're usually populated by people who are just looking for fun and entertaining. Ending3: Find a company that offers services near your area and meets your standards for accommodations, activities and other amenities. [substeps] Cruise packages are priced per person, and will ordinarily run you anywhere from $3 , 000-5 , 000. Ending4: Think about which cruise that company is offering and how much time you can spare on your expedition trip. [substeps] Some cruise lines may accept a trip of only one or two days; others may require more trips, such as longer stays or longer nights out on different tours.

Answer format: ending1/ending2/ending3/ending4