First, I am the owner of Pucon Kayak Hostel. Second, Chile is a fairly bugless snakeless country due to geographical boundaries: Atacama Desert North, Andes east, Gulfo de Ancud and tundra to south, and Pacific to west.
While, PKH is all but booked full for the December season I'd still like to thank the previous endorsement. As well, publicly state that we are enthusiastic and grateful to host any kayaker nomads seeking a do-it-yourself or all-inclusive kayak program. PKH is in the heart of Chile's most blessed area of waterfalls, river runs, lakes and lagunas ranging from class I to V. Like all the destinations listed Chile is spectacular.
What an exciting time for you to plan a trip with such fantastic programs and destinations. I saw earlier on here a Stephen Wright trip to the White Nile at 13 days for $us1400 that is almost impossible to match and I think one of the best all-inclusive deals available. But if you are not into freestyle then all the other options are great.
Things to look for in making your decision: price point vs. quality of trip (what are the resources and history of the program? All the ones I saw listed are top shelf. Do you prefer a budget trip or a plusher all-inclusive package?); destination and type of paddling- note the destinations listed are quite different. What would you most enjoy in your adventure? Eg- Chile is much different than a rainforest trip. Uganda is it's own experience too.
Are you seeking cultural experiences too? What does the program you're considering offer in that regard.
Best of luck and make sure to share your experiences with us. if you choose one of those great companies then do them a favor and share with us some fotos and stories. I know company owners love you for that.
Owner- Pucon Kayak Hostel
Director- Patagonia Study Abroad