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Sek O
Sek O is a wonderful beach with perfect sea view in the south of Hong Kong.
I'm writing this in December, so let's start with the heated pools. The indoor pools I visit regularly are the public government-run pool in Kowloon park [NB Kowloon park indoor pool is closed for renovation from 1 Dec 2007 - 30 Nov 2008], and the pool at the South China Amateur Athletic Association in Caroline Hill. As a family we've recently joined the Stanford Swimming club, so I've also been swimming there a few times over the last few months.
There are more options from April to the end of November, as the outdoor public pools are open then. I have to avoid the strong sunshine, so I only visit the outdoor pools in late afternoon / evening. Most often I'll head to the public pools in Kennedy Town or Victoria Park.
We're lucky to have lots of good beaches too. You can certainly swim all year round, though in winter it is more of a quick dash in and out. During summertime the seawater is very comfortable, and both you and your children can stay in as long as you want. I find it is getting chilly around November-time, which is when the government chart shows the sea temperature drops under 23 deg. C. It keeps falling, dropping under 17 deg. C. in February, then warming up til it passes the 23 deg. mark again around mid-April. Jun-Oct see the temperature hover around 27 deg!
On Hong Kong island we regularly visit Deep Water Bay and Chung Hom Kok beach. A little further away we like Lo So Shing on Lamma. Then my favourite is Tai Long Wan in the North-east New Territories. That needs a longer hike to get to though, so we won't be going there again until our girls are older.