I do my camping via motorcycle. I get every other Friday off, and will often do a short, two night trip somewhere that has twisty roads to play on. I also take two longer, 6 to 10 trips each spring and fall. I use Provincial or State parks often, as those services have good maps of where the campgrounds are. I also like US Forest Service campgrounds, which can be found by browsing the arcane pages at the USFS (they don't seem to have a standard, and each forest arranges its page as they like, and finding information can be difficult).
However, the folks at Forest Camping have done a nice job, but do not have a map. They can be found here:
I have found the National Forests are the hidden jewel of camping out west. As are the BC Recreation Sites (formerly BC Forests Recreation Sites, now a seperate department). They are less crowded, out of the way, and usually well set up. If in BC, many of those sites can be found here: http://www.campingrvbc.com/
with a nice Google mpas based app. Or their official site: http://www.sitesandtrailsbc.ca/
, which does have a map application, but it is a huge pain to use.
Washington and Oregon States both have excellent online resources for their state parks, as does BC Parks. With the exception of a trip to London UK a couple of years back, I have not stayed in a hotel in years.