Paul,
Some of the things I have done are; first and foremost is I made the Sun Screens for all windows including the doors. Now that I've used them for a while I'm delighted with them. I case you missed my earlier post on them, you can see them at
http://www.msnusers.com/azstar/ click on "Pictures" on the left, also do a search to possibly find my earlier post. I posted it under Sun Screens, I think.
If you make these window Sun Screens make sure they are large enough to cover the Alum window frames. The Frames are great for heat transfer, so they need to be out of the sun as well.
Other things I do is to put the vent pillows I bought from CW in place and I also cut a piece of 1" thick styrofoam to fit in the Sky Light.
We also have Slide Toppers on our slides.
Hope this helps