You can buy day passes for the transit system in the gift shop on the ferries .

There are so many micro-climates in that area, that you can probably choose between about five different sorts of experiences, not to mention all the historical choices.

I'll see if any of my photographically oriented friends over there have any suggestions and pm you if I get any results.

Photo Bob here on APUG (and BWKate if she should check in) would be great local resources.