By Peter Mikelbank

Talk about a perfect vacation: George Clooney is cruising the Mediterranean with one of the world's most famous supermodels – who brought along her husband and children.

Clooney is spending his mid-summer with Cindy Crawford, her husband (and Clooney pal) Rande Gerber and their two children, Presley, 8, and Kaia, 6.

Not only is this the second year in a row that the adult trio have cruised together, but the world's most eligible bachelor also sometimes provides his babysitting services – as well as his barbecuing talents.

After bobbing about St. Tropez harbor on the yacht Silver for a day, Clooney handled the Saturday luncheon grill chores for Crawford, Gerber and several others, including nearby resident Bono.

Later on, around midnight, Clooney and his cruismates stepped ashore, to meet a group of friends and go clubbing at the Caveau du Roy. The trio stayed until 2 a.m., with one clubgoer telling PEOPLE that Clooney went dateless at the nightclub.

On Monday, the Silver cruised back up the French coastline to anchor off Eze, where the party moved to Bono's residence. At last sighting, the boating party was off Sardinia's Porto Cervo, with Cindy and Gerber swimming and jet-skiing daily.

As for his own vacation activities, Clooney is playing it low key. Scheduled to open the Venice Film Festival with Brad Pitt at the end of August in the Coen Brothers' Burn After Reading, he has been spotted on deck regularly working out with the morning papers.