Beach/Resort destination in Phuket

Just wanting to get some help with selecting a destination in Phuket for 6 nights. We have been to Phuket 5 times, but we usually head to Koh Samui for the majority of our stay. This time we are staying in Phuket. We are staying in Bang Tao for 4 nights, then heading up to Khao Lak for 5 nights and then heading back to Phuket for 6 remaining nights. We don't want to stay in Patong, we just want a really good family resort (big pool, waterslide etc) that is near the beach and walking distance, short ride to restaurants. Can anyone recommend a location or even a resort. We were considering Karon, but are happy to consider other locations.

Thanks in advance :)