As surprising as this may come to a lot of people, San Jose actually hits water. At one point Alviso in Northern San Jose was a bustling seaport, and over time the area became completely unusable for any type of recreational boating. After many years of hard work, the Alviso Slough is dredged to the point where you can actually take a kayak or small boat (as large as 30ft in high tide), launch it from Alviso's "marina," and take it all the way into the SF Bay. Hopefully, this will open up the doors to all sorts of potential improvements to the Alviso area and provide San Joseans some recreational boating options once more. For more info on the grand opening of the Alviso boat ramp,
just take a look at this Merc article.