The officers were caught on the way to Weston-super-Mare
The Independent Police Complaints Commission (IPCC) said two other Gwent officers were fined and a fifth resigned ahead of the conduct hearing.
Newspapers reported the Pcs were caught when a vehicle broke down on the way to Weston-super-Mare, after previous visits to Barry Island and Porthcawl.
Gwent Police said officers must face "the consequence of their actions".
It was claimed colleagues dubbed the group, four men and a woman, "the seaside five".
No wonder the police didn't come when my car got shot, they were too busy at the local beach!