If you like doing stitched panoramas, how about the 135mm F2 or 200mm F2.8? With a multi-row panorama kit you can shoot as wide as you like, and the resolution is amazing. Of course there are a few potential problems:
You need enough detail in each frame to enable the software (I use Photoshop) to stitch the frames. If some of your frames contain only ocean and sky, it probably won't work.
Depth of focus might be an issue with longer lenses if some parts of the scene are relatively nearby.
You'll want a computer with plenty of memory to handle big panoramas. My 8GB machine isn't really adequate - it gets the job done, but takes ages. You might be able to get away with 16GB, but I'd recommend at least 32GB, and plan on putting 64GB in my next machine. Fortunately memory is cheaper than it's ever been.