President Barack Obama went snorkeling at Hanauma Bay with family and friends on Tuesday, the 11th day of his Hawaiian vacation.

The motorcade arrived at Hanauma Bay Nature Preserve, which is normally closed to the public on Tuesdays, shortly before noon. It departed for the first family’s rented Kailua vacation compound shortly before 3:30 p.m.

Earlier in the day, the president left the Kailua compound for a workout at Marine Corps Base Hawaii, which got underway at about 8:25 a.m.

Also on Tuesday, the president declared a major disaster in Oklahoma and ordered federal aid to supplement state, tribal and local recovery efforts in the areas affected by late November’s severe winter storms and flooding.

On Monday afternoon, as the president and friends were returning from golf at the Mid Pacific Country Club, the Secret Service stopped a man who briefly flew a drone near the president’s motorcade.

In a written statement, the Secret Service said the man was “completely unaware that the presidential motorcade would be transiting the area of operation and immediately complied with law enforcement requests to cease and desist. No charges were filed.”

The Federal Aviation Administration has issued flight restrictions for the area around Kailua, where the president is staying during his vacation. That restriction includes drones.

That area includes a highly restricted inner core roughly circling Marine Corps Base Hawaii in Kaneohe, with a 10-nautical-mile radius. Excluded is a slice southwest of Koko Crater. An outer, less restrictive ring encompasses the airspace between 10 and 30 nautical miles from the center of the temporary flight-restricted area.