My family is planning a vacation next year to visit some national parks in the West next year, which would include Yellowstone, Glacier and Wind Cave. We'll be doing a bit of walking/hiking, so I'd like to keep the gear weight down. For most of the lenses I am thinking of bringing, there would be multiple scenarios for their use. The only one that would be used in only one spot would be a fast wide prime (20A). Tripods are allowed in Luray Caverns, but they are not in Wind Cave. Is it worth bringing a fast wide prime for this one spot? The last time I was at Wind Cave was 20+ years ago, and that was pre-camera days.