Nope. Call the FSS. The FAA has a lost aircraft drill that involves calling towers, FBOs, trying to raise the airplane on Guard, etc. that they run before they call the AFRCC.
But ... please get flight following. I am a CAP Air Branch Director and there is nothing more valuable to us than a radar track. Now it is possible that someone will be able to figure out what 1200 airplane you are and give us a track, but I would not bet on it. Plus, when you have flight following, all you have to do is key your mic in order to declare an emergency and get help. Now, FF is not available at all altitudes of course, but try to fly high enough that you can get it for your whole route. Even if it's only partial, though, at least it gives us some idea of your progress.
RE VFR flight plans, I am not a fan. It's better than nothing, but all it does is give us a flight route with no narrowing of where you might be. It's basically the same as a "family flight plan."
If you are going to wander around without filing anything and without getting flight following, please make sure you have a 406mhz. ELT. If it triggers, which is not a given, you will be pinpointed. Remember, the SARSAT system no longer monitors 121.5.