Why is it so hard to go camping?

I don't know if any of you remember the post last September about us trying to go camping over Labor Day weekend. Well, it didn't happen because it was snow with lightning and thunder in a 3 hour radius of our house in every direction. So, this year when Memorial Day weekend came I wanted to go camping. We didn't end up going because Steve was so busy with school that we just didn't have the time. So, the first weekend we had available to go again was this past weekend. We have been planning on it forever. We got everything packed and drove up the canyon to go, but the first place we wanted to go was still closed from winter. Then, we drove to another place up Little Cottonwood Canyon and they were completely full. I was not happy at this point because I was so excited to finally be going camping. Steve had planned all the meals and everything so that we could dutch oven. We drove over to my parents and called every place that was within an hour of our house and not one place had an open site! How is that possible! I was definitely not happy at this point, but we decided to make the best of it anyway. We still dutch ovened that night and then on Saturday we spent the day up Millcreek Canyon playing games and then Steve made dinner again that night. It was probably the next best thing to camping, but still not as good. The next weekend we have available is the weekend before my due date. I figure we might as well plan on it because it probably won't happen. That would mean the baby is already born, and that would definitely be better. So, one of the two might as well happen.