15 Adventure Travel Companies that Offer Small Group Tours 01 of 15. G Adventures. © 2011 Lois Friedland. 02 of 15. Intrepid Travel. Courtesy of Intrepid Travel. 03 of 15. Mountain Travel Sobek. 04 of 15. Tusker Trail. 05 of 15. Flash Pack. 06 of 15. Abercrombie & Kent. 07 of 15. Austin Adventures. 08 of 15. Tauck.