Yes, our family (with 2 boys 1.5 yr and 4.5 yr) went there during Lunar New Year, quite good. As another mommy said, kids did not eat BBQ food much, if you just want to have outdoor activity with sunshine and freshair for kids, it is good place, the kids were very excited at picking strawberries, you can fly kite also, and I saw some kids ride bicycle (not sure brought by themselves or not). Daddy was even happier (a big fans of BBQ). The place can keep the kids busy without disburbing his BBQ activity.
I know Tai Tong has similar area with bigger place and even wider range of facilities, such as horse riding and feeding, may be even better for elder kids just like yours.