The 100 Waterfalls Trek can only be tackled as a one-day tour from Nong Khiaw by Tiger Trails, a Luang Prabang-based ecotourism company led by German founder Markus Neuer.
"The two of us have had a great partnership for five years, " said Smith, whose team depart for a two-Test, three one-day match tour of India on Saturday.
His comments reflect those made by his former sparring partner Geoffrey Boycott after the defeat in Brisbane, when he said England should have played at least one four-day tour match.