There are no real secrets to SERE. Its the best and most miserable training I've ever received. Its not fun and its not meant to be. You will learn a lot about yourself and realize that you are, in most cases, a lot tougher than you think.
San Diego in the summer or Brunswick in the winter, pick your poison. I went to the lovely Werner Springs in the summer and lost twenty pounds in just over five days.
I went after flight school and before checking into the RAG, that is the most common timeline these days. Whatever the case you MUST have attended before deploying with a fleet squadron.
You wont, at least you shouldn't find anyone on here who is going to give you too many details of the training. You're doing yourself a disservice if you go into the course thinking you know what is going to happen. Everyone always wants to get the gouge, understandable, but trust me on this one, just apply what they teach you in the course and you'll be just fine.