I think the most secure way to do that (depending on where you are) is to take out the bitcoin in cash first. Go to localbitcoins.com and find a reliable seller who isn't charging too much. Then meet him, exchange and take the cash to your local bullion dealer. Almost every city has a few exchange offices that sell gold as well. They trade physical gold, 24 caret, for most cash.

But some countries have restrictions on bitcoin transactions and / or gold transactions. In India, gold is at least 10% above midmarket price. In the middle east it's about 1%. It all depends on where you are and how hard it is to get your hands on it.