IanMckpw, hi and welcome,
Probably it would help me help you if you gave a little more information.
How old are your children, do you have any surfing or ocean experience, can your children swim?
All of Europe’s beaches are shut down due to the virus for an unknown amount of time and the warmer places are hit hard by the virus and travel to them will be difficult.
Where are you planning to travel from , my your moniker sunny Scotland?
I will assist you in planning this when I know those answers.
Cheers stay safe stay well!

Just read you other post and that had all the information, I lived at Clareville after DeeWhy and so North Avalon and Little Avalon were my playground until about late 1970s, and doing Sri Lanka stands you in good stead, talk more as the virus subsides.