Hunstanton RNLI hovercraft launched when a father and his two daughters got into trouble off the promenade.
The holidaymakers were cut off by the incoming tide when they ventured out to sandbanks opposite the Oasis leisure centre on Tuesday.
The girls, aged eight and 12, clung to their father as they were swept by the current towards Heacham. An RNLI spokesman confirmed the hovercraft was launched at 3.30pm, but the trio had got ashore and were checked by paramedics.
Hunstanton Coastguard station manager Michael Fysh said spring tides can be risky.
“When they turn, they come in as quick as you can walk, and the water can get quite deep. “We would advise people not to go out to the sandbanks,” he said.