First of all good luck at the shoot ! But you do not need any filters anymore, shoot in RAW and PP in whatever you feel comfortable in. A CPL (Heliopan or B+W/SChneider Kreuznach) and a ND filter can give you some options...like no reflections deeper color and long exposure to get silky clouds or water. You say you are taking a TRIPOD with you....then you can use any lens you have (the best, sharpest, most accurate, durable, not to heavy) and shoot in pano (with or without combo of exposure..bracketing/under- and over exposing....lets say up to 9 shots). The money you save could be spent on a backupdrive (so you do not loose your precious photo's while heading back home. Keep in mind that it takes patience and time to get the shot right, so no matter what gear you use, make sure you know it thru and thru and use its potential. Do not forget to also look in B&W, meaning loads of contrast/clouds etc....you would be surprised what possibilies you get when doing that :-)....and make sure you check the ISO before you start...
Just my 2 cents.