The rooms have electricity and ceiling fans, as well as hot water provided by burning cahoune (sp?) nuts. I wish that I had taken a photo of the inside of a cabana, but they are very nice and have a unique design.
The lodge at night is ever more beuatiful than during the day. Between the noise comign from the jungle, the stars and the kerosene lamps, it is pretty romantic. The food is excellent - Vicki is from Trinidad originally so there is a West Indian flavour to everything, but it's a mix of styles.
I'm sure that you could put a lamp or candle inside your cabana instead of having the electic light, too.
We didn't go tubing, but swimming at the Red Cliff pool was fun - there is a large circular slow-moving current that you can stay in for ages.
We saw kinkajous in the trees beside the lodge and many birds, especially hummingbirds. There are all sorts of butterflies and moths as well. You can do a night hike with Ray and his night vision goggles... I'd say that you'd see more wildlife at night.
Have a great trip!