As you know, there's a Disneyland park hopper ticket! You use it so if you go to Disneyland and you get bored, you can just go hop over to Disney's California Adventure for free, and if you get bored there, just hop back to Disneyland again! You can keep doing this until your park hopper ticket expires! For more info and the prices, visit this link: http://disneyland.disney.go.com/disneyland/en_US/r eserve/ticketListing?name=TicketListingPage