I'm just a hobbiest hack as far as photography is concerned, so take this with a grain of salt, but I did take some photographs recently for a Beachish wedding…….with K5II and a K3. I found it reasonably logical……..I won't bother with the normal stuff (i.e. visit locations, shot plan, consider approach for different weather scenarios, bring props etc……) but with pentax cameras you really need to shoot Raw (obviously) and plan how you want to balance the inevitable artistic compromise shot by shot with Highlights versus shadow recovery, especially at the beach……..ie
[url=https://flic.kr/p/qS9Y5p]
by
Noelpolar, on Flickr
We took this seat from home
] by
Noelpolar, on Flickr
Also look just back from the beach for other interesting coastal things
by
Noelpolar, on Flickr
I used some flash (best one can) and a bit of reflector from time to time for the backlit shots. If really bright you may need to consider a ND filter and/or CPL to be able to get rid of some reflections and/or open your lens a bit for the obvious SDOF shots. I assume you know that Pentax cameras allow you to pull up the shadows by 3 or so stops…..but blown highlights are goodbye mostly.
Worth investing in Huelight Color profiles for your raw processing as well.
Obviously the light changes significantly in the last hour or so if the wedding is near the evening……as was the one I did recently.
Be aware of the sun and how people respond to it……squinting….sunnies etc
One last obvious thing….it's a beach wedding…. so it can be less formal…..