RNLI volunteers from Beaumaris were called out to two incidents during Palm Sunday.
The crew had just returned from training at Puffin Island when were alerted to an empty rowing boat near Caernarfon.
The inshore lifeboat set out at just before 12.10pm and found the rowing boat had been left unoccupied - it was taken ashore and beached above the high water mark.
Just over an hour after returning to the station to be refuelled and cleaned, the Coastguard tasked volunteers to a yacht that was drift after apparently slipping her moorings.
The RNLI said it was creating a navigation hazard and the danger that her crew might try to return to the yacht in conditions that were unsuitable for a small rowing boat.
The helm assessed the situation before deciding the unmanned yacht should be towed to the nearest safe location amid the building strength of the tidal currents. It was towed and berthed at the craft alongside Beaumaris Pier.
A spokesperson at RNLI Beaumaris said: "The people ashore did the correct thing in reporting these vessels to the Coastguard."
Earlier, the Beaumaris crew joined other lifeboat teams from Moelfre, Llandudno and Conwy in a joint training exercise at Puffin Island.
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