Hi
I would recommend Santa Ponsa - lively but not as busy as Magaluf.
We took our very active son for the first time when he was just 5 and we have been returned there serveral times. We had a great time and there was loads for him and us to do. Nice beach with pedalos etc. Loads of child friendly bars - Burlington Berties which had a kids club - you can sit and have a drink whilst kids are entertained. Scots Corner had a couple of bouncy castles and things for kids to do. Wide selection of places to eat from Burger King & McDonalds to traditonal english pub grub, mexican, chinese, indian, etc etc etc
Great entertainment in The Square which is located at the quieter end of SP in an area called Costa de la Calma - every night there is family entertainment from 8.30 to 11.30 - face painting, kids games, disco - every night a different tribute band is on stage in the centre of the square - Madonna, Westlife, Robbie Williams, Abba etc - you just sit outside which ever bar you want and you can watch the entertainment - we felt this area was safe for kids and were happy to let our son mix with the other kids there.
There are a couple of little parks with play equipment in SP- but we were quite lucky as our apartments (Jardin del Mar) had a kids play area with swings, wendy houses, slide, climbing frame, football pitch, snooker and a childs pool, so during the day we saw very little of our son!!
Have a look at
http://www.santa-ponsa.com this has maps and lists of apartments, bars & restaurants etc plus loads of info about the area.
SP is only about 10 mins drive away from 2 massive water parks - Western Water Park & Aqualand. Also in Magaluf is The Pirates Adventure and about 20 mins drive away is Marineland.
Have a look at the SP web site and have a look at all the review on Holiday Truths.
We love Santa Ponsa and cant wait to go back again next year. If you want any more info or have any questions just send me a pm.
Carmel