No mouseboats at POR or POFQ. You can rent "regular" boats from the marina at POR, but no watermice. There's just a "river" that goes down to the lake by Downtown Disney, so no where to run those little boats. I know you can rent the watermice from DD, but you have to stay in the lake.
One major thing to know about the watermice though:
The motors on the big lakes are 9 horsepower.
The motors at the CRB and other small lakes are ONLY 3 horsepower. They are slooooooooooooooow.
Prices are the same. For the most fun for your dollar, only rent the 9hp watermice! I was very disappointed when we rented them at the CRB. (But then, I'm a horsepower junkie!)
Thanks for the HP info! Last year at WL DD4 & I loved speeding around at full throttle. In fact DD4 kept saying, "Faster, Daddy, faster!!" From your info, I'm sure the mouseboats at CBR would not be the same.