Eisner picked up one of his major inspirations for promoting the Disney parks from his wife during a social evening with friends. After Jeannie Yeager and Burr Rutan returned from their flight around the world without stopping or refueling--a first--they had dinner with Michael and Jane Eisner. Michael asked the obvious question after such an achievement: "What are you doing next?" Their reply was surprising: "We're going to Disneyland." Jane turned to her husband and said, "Michael, you've got to use that." As a result, in 1987 Disney began featuring ads after great sports events like the Super Bowl and the World Series. The hero of the hour would be caught walking off the field. An off-screen narrator would pop the question, "Now that you've won, what are you going to do next?" The hero of the hour would reply, "I'm going to Disneyland!"

1/81 Disneyland welcomed their 200 millionth guest
8/85 Disneyland welcomed their 250 millionth guest
7/97 Disneyland welcomed their 400 millionth guest

So I would say about 10 million a year average I have heard they get about 60,000 guests per day during weekends in the summer, which would leave about 25,000 a day average for other days during the year. And at an average of $35 admission (1,3,5 day passports) that would be $875,000-$2.1 million per day in admission alone.
Not counting food (which I have heard each resturant on a good summer day can take in $20,000) and souvenirs!!