I'd agree with Chari -
PDO has always felt pretty safe to us, but then again, we have never stayed anywhere
other than PDO or the Mirador next door (when it was trailers and the 4 beachfront units).
The security at PDO are pretty decent folks - I had gone to bed one night, and my wife was sitting on the breakwall shooting the breeze with one of the security guys for an hour or so,
she said she felt comfortable being there - knowing security was there.
Also, she mentioned without his company, she would have come back sooner.
I would suggest not roaming the beaches alone at night most places.