Went in early September. Glad I got to go before the close for the season!! (I think its usually mid/late September depending on the weather).
Place is easy to find, didn't need a reservation, its affordable, and everythings in good condition.
Lady working there was fluent in English, helpful, friendly, and let me keep my purse in the room with her while I went onto the water. I'd say budget about an hour; I went to the end of the kayak-able section and back in about that time. There's nothing breathtakingly beautiful or a must see but itwas definitely relaxing and enjoyable. Plus, its right next to Atwater market!