The days when both Cambodia and Laos were countries where you could travel only by plane, unless you were an adventurer, are long gone. Roads are improved, buses are regular, and as a result the internal flight network is vastly reduced. Having said that, both countries remain very much in the developing stage, and charging around with a must-do checklist in a short space of time makes little sense. The pace of life, particularly in Laos and rural Cambodia, is slow (though Phnom Penh is frenetic these days), so a more leisurely trip will keep you in tune with those around you. It is a good idea to think of what interests you most before you set off. If you like history and ancient temples, then consider making Luang Prabang and Siem Reap the central part of your trip. If nature is your thing, then river trips and protected areas in the north of Laos should be the priority. For beaches and relaxation, start with the laid-back islands in the Mekong in southern Laos, followed by time spent on the beach at Sihanoukville in Cambodia. The mix-and-match opportunities are wide and varied.
Note: This information was accurate when it was published, but can change without notice. Please be sure to confirm all rates and details directly with the companies in question before planning your trip.