Who doesn't like models? Take the kids to see a real, scaled model of the San Francisco Bay and the Sacramento / San Joaquin river delta system at the Bay Model Visitor Center.
Roughly every 14 minutes represents a lunar day, or 24 hours, for the model. Within that 14 minutes, there will be 2 high and low tides. When the tides change, the water will flow throughout the model.
The model represents about 1,600 square miles of land and water. The horizontal scale is 1,000 to 1. So for every thousand feet of real land or water, there is one foot on the model that represents it. The vertical scale is 100 to 1. That's also measured in feet.
Every morning the model gets flooded with about 135,000 gallons of water. It takes about 20 minutes to do this. Then at the end of the day, all the water gets drained out into a storage tank.
Last Bit of Advice
If you're getting into boating or fishing with the kids, this model could be a great help.