South end of Kuta around here has smaller waves coz the beach is blocked by the Tuban reef, Kuta reef etc You can walk North for more size.
www.tripadvisor.com/Hotel_Review-g297697-d1197452-Reviews-Bali_Garden_Beach_Resort-Kuta_Kuta_District_Bali.htmlIf you want to get out of Kuta this place has Berawa out front & old mans 5 mins walk North. Size depends on the day, but the waves are fat/easy. Although the waves break a little offshore on patches of reef, the beach is sand.
www.tripadvisor.com.au/Hotel_Review-g311298-d636133-Reviews-Legong_Keraton_Beach_Hotel-Canggu_Bali.htmlSouth Kuta would probably be best in my opinion. Kids often like to be able to touch the ground with their feet & the size of the wave is more controllable by simply walking North or South. Canngu areas would have more clusters of more experienced surfers & the wind is generally sideshore by mid day, while Kuta is still nice & offshore. There are also heaps more shops/massages/ restaurants in South Kuta. And waterbomb park, a must for the kids is pretty much just over the road from that Hotel. Could be booked out for those school holidays though (Bali Garden Hotel). You can click map & zoom in for more options in that area.