national sandwich day | No. 1 aquarium. More than 623 marine species are on display, so allow at least 3 hours to fully enjoy the aquarium#39;s galleries, touch pools and exhibits. You can easily spend the entire day here. For the best photos, turn off your flash and set ISO to 400. The outer deck opens up to Monterey Bay National Marine Sanctuary, home to the nation#39;s largest kelp forest and one of the world#39;s most diverse marine ecosystems. The sanctuary runs 276 miles from Cambria to Marin. Throngs of ... [More] [Less]