Do you have a guidebook yet? Like Mark said there are some good runs near the town of Santo Domingo (I assume that's what Pete is talking about too, 3hrs from his place).
Our guidebook covers quite a few runs in this area, but there is also more exploring to be done around there if you are feeling motivated!
Send me an email or give me a call and I can get you a book [email protected]
970 309 8913 and discuss other "off the beaten path" areas to paddle if you are into that.
Also, Larry left for Ecuador today, if you need anything while you are down there help, advice, etc...call him and he'll be happy to help. His cell phone in Ecuador is 09 792 0120 and you can call him from any phone office in Quito or elsewhere.
Did you decide to try to bring your own kayak down?