If this nomadic lifestyle suits them well Marvin even caught his first fish to feed the family, the return to land is sometimes necessary to stretch his legs and refuel. By going to the port closest to their anchorage, it is what the family thought they could do, but the deconfinement is not yet in effect in Spain. If it is possible to sail, apparently it is not possible to disembark.
They left to report to the harbour master's office and ask permission to leave their dinghy on the pontoon while they visited the town and went shopping, and they finally had a bit of a rough time. The port is private and they are forbidden to disembark, in which case the police will intervene
This unpleasant welcome confirms to the couple that they are much happier in their solitary lifestyle on the water.