if youve got a photo driving licence take that as well, ive always used mine in BG instead of the passport. Remember, we are the odd ones, demanding actual passports, a lot of europe will allow photo id cards!
As long as it is still valid until your return its ok to travel in EU, EEA and CH. Taking driving licence with you doesnt give you any extra time for traveling. Its a permit to drive car. They cant refuse an entry because they have to maintain the same laws to all EU members. THIS IS A FACT!!! Im a border guard.