First, let me refer you to the official information:  www.academyadmissions.com

You look like you will be very strong on academics.  Academics are 60% of the Whole Candidate Score (what admissions uses).

You really should have at least one sport.  It does not need to be school related.  Club sports, competitive martial arts, etc. work too.

Leadership--you really need to have some leadership experience.  It can be things like club president, class president/treasurer/etc, boy scout leadership, CAP leadership, or a variety of other things.  The important thing is to be involved in at least a couple things and also lead.