Although the WSJ reported, "It will still be illegal for Americans to travel to Cuba strictly for tourism, since that is banned by federal law," that is not true.
It is not illegal - nor has it ever been - for Americans to travel to Cuba strictly for tourism. The restriction is that no American may pay any cost of a tourist trip to Cuba. Thus if a person is a U.S. citizen and her/his girlfriend/boyfriend/uncle/friend is not an American and that person is generous and pays the entire cost of the trip, the American may make the trip. Save the receipts -- even giving a $0.01 tip -- is a violation of the Embargo and could end the American with hefty fines.