WIth kids, best to head towards Mar Menor, Los Alcazeres, Los Narañjos etc towards St Javier airport, busy but the water is shallow and there are bars and restaurants around! Mazarron Port beach is OK and Bol Neuvo is alright too, but then La Manga strip is just as far away in the car and there are KM's of beach on both sides, Mar Menor and Med!
Fancy a bit of nude sunbathing then try El Portus, specail nudist beach, myself, I don't think so!
There is a water park just the other side of Murcia, great fun for the day!
Fancy a day sight seeing, Alicante, beleive it or not, all around the port is great, plus lots of great shoe shops for the Missus!
WAnt to try some horse riding whilst you are here, great stable just 15 mins drive away, great selection of horse's and ponies, beginners welcome, call Liz or Vero 636 172 178!
Enjoy