The main attraction for kids in Tel Aviv is, of course, the sea! The western part of the city is one big beach strip - for families with children we recommend the paid Ha-Tzuk with playgrounds and picnic lawns or Nordau with playgrounds.
If the weather is bad, head to the Ramat Gan Safari Park, the largest zoo in the Middle East, where the animals live without cages and cages! Of course, not all of them - there are special conditions for lions, rhinos, and elephants.