The price isn't that bad for the LSD and install, so even if you weren't going on the beach, I'd say get it for sure. I had the TRD LSD in my 2wd Tacoma and I loved it every bit.
As far as it actually helping you not get stuck, that's debatable. The conditions of the sand will play a big role, but not having a lead foot in the sand will help.
As far as it actually helping you not get stuck, that's debatable. The conditions of the sand will play a big role, but not having a lead foot in the sand will help.