Jimbaran bay is a great place for spending time relaxing by the beach. You can go there in the evening at about 6 and enjoy the sunset on the sunset. Your kids probably likes running around and playing around the beach. You can order the food at the restaurant or cafe where you stop for dinner.
One of my favorite place for dinner in Jimbaran is in Kelan village. This is toward northern end of the bay. It's located closer to the airport, but far enough that you can't hear the sound of the planes.
I like this place because it's more quiet. There are not many cafe near by so there are less people. There are music, but they are not so loud.
In the main area of Jimbaran, where most of the cafes or restaurants are located, there are usually lots of traffic. Traffic in Kelan is less, hence it's easy to drive around.
This photo is from one of the cafe in Kelan.