What a fun trip! When DH and I go sailing for a few days with an icebox and our tiny PITA alcohol stove, sometimes I remind myself that we are on holiday, and a few days with a pretty basic diet, rather than our usual super-picky-fresh-organic-everything diet will do no harm. :)
After a long, busy day of hiking or whatever you have planned, it's often really nice to not have to do a lot of meal prep. We do a good quality canned soup, or a jar of pasta sauce with dry pasta, or the above-mentioned jar of curry sauce with simple veggies that don't need refrigeration (carrots or other roots, potatoes, cauliflower) and a quick rice. Breakfasts are eggs and toast, or yogurt, granola and fruit (nectarines, blueberries--fruit that is again shelf-stable and won't go mushy quickly). Lunches can be dehydrated soups, prepared deli foods like potato salad, coleslaw, etc if you have room in your cooler. Canned beans make easy salads. We also always make sure to bring ourselves some treats! Chocolate, baked goods, tortilla chips and salsa...snacky things to round out the edges. Shopping in new places makes that part fun and easy, usually. :)
I'm a fan of picking veggies and fruit that are easily mixed and matched between meals, but also easily snacked on raw: celery, cauliflower, carrots, snap peas.
Definitely bring a few containers for leftovers, too. If you'll be in one place for the few days and can keep dinner leftovers to eat for lunch. Sometimes it's hard to adjust for quantities when you're used to cooking for more people!