Mohave,
The three red arrows is the lower parking lot. Point A on your map is NOT the lower parking lot as it says. That is the Hunters camp. Please keep the gate there closed. I usually prefer the Hunters camp when I am camping out, but not always.
The Lower parking lot has a lot of foot traffic the Hunters camp seldom has anyone there. So I feel safer there and it is @ 1/4 of a mile shorter than hiking to the lower lot.
Have a good hot spring hike ;~)