The most essential item is a polarising filter – plus a wide angle lens for those monster big blue skies. Look at getting some step down rings to allow you to use your polariser on smaller filter threads – I often use one of my 77mm polarisers on a 67mm thread with a ring, works great.
If the sky is looking good, really use it as a big part of your photos – don’t be afraid to get down low and put anglers against it if that makes sense.
And if you get any scuddy greay days, it can be tough to make them look anywhere half-dcent on the flats – use a longer lens and keep as tight as possible.
You will have a blast.