Active in my mind means the fans are interacting with you or the content on your page...liking, commenting, sharing. Continue to post interesting content. What may seem like a normal post to someone else, might be new or fascinating to another. You have to also be active on your page if you want fans to be active as well.
best way is to target your niche of people, and advertise in those categories on facebook. trust me its worth it. or pay people who have large fan base to give you shout out and what not.
Post Attractive Images and Views on Regular basis Be an Active User Proper replies of your fans questions Join multiple groups or communities
A good start can always come from a group a friends Ask them to like the page .. share and comment the posts you came .. And as long as the posts are interesting, you will see that you will get more and more fans, and activity.
you can make you Facebook page fans active by good posting create 30+ post in a day and you get result in 7 days