thats pretty much all you will need, just make sure that you get a good one, Tiffen and Hoya are both good filters- i actually ordered a couple the other day from http://www.7dayshop.com . they are actually having a ‘clearout’ at the moment so it’s worth taking a look some good bargains to be had.
great pics !Being a native islander myself ,these pictures bring back memories of visiting the tunnels as a child!! haven’t been there in a long time but ive been told they spent a fortune restoring them throughout the last few years