To plan or not to plan?

We will begin full-timing in January. We have our general route for 2014 planned out, as there are many places we want to get to during the year. For the entire year, we have exactly one campground reservation for a week. While browsing the area for campgrounds, we noticed that most of them were already booked and the number of sites was dwindling quickly. Because the time and location was important (family and spring training) we booked. Otherwise, we have a general idea of what is available in the areas we want to stay and will hope for the best. We prefer to boondock, so most times it doesn't matter anyway.