Keep your pack going in to 35-40 lbs total (tops), leave the cool gadgets, 2nd pair of boots, extra clothes, etc behind. They say you pack your insecurities. You don't need to spend a lot on ultralight gear. And like bowfiend said, you might consider day trips, don't know the terrain there but 3-4 miles isn't much. And don't write-off internal frame packs, used externals for years and am now sold on my internal frame, have hauled 80-110 lbs a number of times (MEAT !) with it and was way more comfortable than my internal frame. And have a good time !