Rented kayaks here on a beautiful, sunny afternoon with my husband & brother who was visiting from LA.
You get an hour and it costs around $15 per person. They offer a 10% discount with an ASU student discount. Weekends are definitely tough to find parking but we paid $10 at one of the covered garages on Ash.
Kayaking is just one rental option, you can rent a boat or a funky water ski thing.
The lake itself isn't the cleanest but one a nice day, it's just fun to spend time outside on the water.
They don't give you any lessons or much instruction so be prepared to wing it!