The last local diversion on our list was to explore Palomar Mountain, the largest mountain in San Diego county; the road to which was just a half-mile from our cabin. The road up is not to be missed, as it provides gorgeous views of Lake Henshaw and the valley around it, as well as sweeping vistas towards San Diego and beyond on the other side.
Near the top of the mountain is a state park, open for picnickers and day hikers. We clambered among the boulders and a sadly disproportionate number of cut and fallen trees until the heat became unbearable again, chasing us back down the mountain before noon. Back at the cabin after lunch we escaped to the pool to spend the rest of the hot afternoon underwater.
We ended our vacation and final night at Lake Henshaw with another fine dinner of fire-roasted hotdogs and s'mores, and spent the twilight hour walking around the mostly empty cabins (number 17 looks very nice, although it's missing the view of the lake), working off the sugar high brought on by entirely too many melted marshmallows, and enjoying our last evening together before parting ways again.