Glad you managed to get some miles in the heat! Right now I am stuck on the trainer or riding quite late at night, it's too much for me.
One small clarification: The $80 pass is not just for Red Rock Canyon. That is the America the Beautiful/National Parks annual pass. It covers all the national parks, most recreational areas like Red Rock, and Forest Service areas. Only thing it doesn't cover is the state parks. I get it every year and it saves us hundreds in fees.
Hope you make it back here sometime in better weather! The summer is bad, but riding in summer kit in late October is pretty nice.