I have been to Puerto Maldonado two years ago, but I didn't had rafting there.
What I can anyway suggest you is to contact Mr. Mirko, who is the oiwner of the guesthouse called "Residencial Amarumayo", phone nr, 084-573860 ( i must look for the email adress if you like).
He helped me a lot and organize a trip into the jungle as I did want, no tourist, no sucks and no traps...
So, guess he will deifnitely able to organzie whatever you are lookinfg for...
Simply give him a call.
If you need anything else, give me a mail,
Enjoy Pto Maldonado for me too!
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