We walked down the mile or so to the lake and signed up for a guided tour with Inuit Kayaks. Our guide, although he spoke absolutely not a lick of English, was wonderful. Between vigorous hand gestures and D's broken Spanish, we mostly understood what he was saying, and we quite enjoyed ourselves in the process.
Most of the islands are inhabited, although some are too small, too protected, or for sale. The houses varied tremendously, from fancy, multi-dwelling compounds with satellite dishes to small shacks that didn't have electricity.
There was one island full of monkeys--three different kinds--who were so used to humans giving them food that if you got your kayak too close to the shore they would leap out onto it from the trees. We watched for a bit but gave them a wide berth, not feeling up to playing host to a flying howler monkey.
It was gloriously, startling sunny and bright the entire time. I was glad I'd insisted we both wear hats and long sleeved shirts.
Not only did we not get sunburned, we were also super fashionable.
You can take a motorized boat tour of the islands if you're not up for kayaking, but the noise tends to scare off any wildlife that might be around. Out on the lake in the kayak, on the other hand, it is so peaceful and beautiful you feel like you're in a painting.