Senior outdoor activity discounts are available to sports fans on the ferries to Giant games at ATT Park. Except if you’re coming from Larkspur where they are $8 each way. Roundtrips from Alameda and Jack London for seniors 65+ are $15, from Vallejo $13. These (often) sunny, splashy cruises are yet another way to make guests from out of town sick with envy. Remember return boats leave sharply 20 minutes after the last out.