The couple visited Cachuma Lake in Santa Barbara, California on Saturday.
Kutcher, 33, and Moore, 48, were joined by Ashton's friend, Eric Buterbaugh, as well as their Kabbalah instructor, Yehuda Berg, who has served as a spiritual advisor.
Both the Two and a Half Men star and Moore are followers of the Jewish philosophy and were last seen together at the Kabbalah Centre to celebrate Rosh Hashanah, the Jewish New Year, at the end of September.
The pair are said to be near a split after reports emerged last month of Kutcher's alleged infidelity on the day of his sixth wedding anniversary.