Twinpalms - the Catch Beach Club has closed down as well as everything else on Surin beach, plus no sun beds or umbrellas allowed. Hotel is still open and Catch has now moved to Bangtao, took over what used to be Bliss Beach Club, presume hotel will shuttle to it.
Nikki Beach club is now Dream Beach Club...the hotel itself is not close to the beach.
Have a look at Andara hotel in Kamala...there is now a Cafe Del Mar Beach Club there.
Keemala hotel is very unusual but not sure on service.
Banyan Tree is allowed sun beds on the beach in a semi-private area next to Angsana.
Also another option is Sarojin at Khao Lak, possibly no children but fairly quiet area.
The Nai Harn has now been refurbished, great beach, nice rooms and views but again service is typically Thai.