[Paddlewise] Renting in SF/Treasure Island

Have a good friend moderately experienced flat water (river + Lake) kayaker 
who wants to rent a kayak while visiting San Francisco.  She will be staying 
on Treasure Island near the Bay Bridge.  Any suggestions of where to rent 
and/or outfitters and possible sights to visit?  She'll be out there late 
March/Early April.  PLease feel free to back Channel so the list isn't bored 
stiff.
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