Rented kayaks from here for my first kayaking adventure. Price was pretty reasonable, and we ended up paying $20 for 90 minutes of paddling. We were able to go down the river and even hit the lake. Unfortunately, I got splashed by my companions and ended up capsizing into the water. Thank god I didn't bring my phone or anything (leave everything of value in the car, except your ID and a credit card).
Watching out for the boats sucked, but it was still tons of fun. Make sure you call ahead just to be sure there are kayaks available. We had no problem getting 5 of them, and there were about 10 total on the grass. Would definitely do it again!