For the sake of exploration and completion, yes, definately.
Not only that, its fun.
Or, alternatively, make a new character, stay clear from the main quest and try to find *everything* there is to find prior to starting/completing it.
^ This
Making a new character and then trying to find/explore different areas will probably be more rewarding. At the level you're at, you will walk right through most enemies, so clearing the caves and ruins for little reward will probably seem like a chore.
Starting with a weak character again (and perhaps a different spec) will add an element of danger and likely be more fun.