My dad always called those nice-short-sweet trips, close enough to home but far enough away, s "shake down cruise". We used them when we'd get a new travel trailer or other rig, to see what the rig needed. When my husband and I started to RV, we did the same. (Our shakedown cruises both took us in the same general neck-of-the-woods your trip was in.) Trying out the tent trailer (pop-up) was our trip to the South Rim of the Grand Canyon, and then the 5th wheel trip was up to Lake Mead. Both were in the March/April time-frame, different years.
Loved reading your report. I didn't know that about Poston!
Donna