Best option is here in our forum. Go to the currency exchange board located here
https://bitcointalk.org/index.php?board=53.0 . Find a very trusted seller with dark green which has an ongoing thread with lots of transactions made and lots of positive feedback. I am sure they will buy your bitcoin with paypal. There are other ways but in my view this is the most problem free way to convert your bitcoin to paypal.
I emphasize again , find a very trusted seller with a big thread , lots of transactions, lots of good trust and sell only to such seller. All others consist of extreme high risk by trading with them through paypal.
It looks like it is the only safe method (still not 100%) to find trusted user (as it was mentioned - with dark green trust).
I tried few other ways, and almost always i have not nice surprises. In my first transaction i lost 0.10 BTC.
Never do any transaction quickly. Do not let be pushed to make a deal! If you have even a small doubt, back off.