Alabang to Antipolo Rizal?

this coming march 12, 2011 we will support "the Believer" at talentadong pinoy that will held at Ynares Sport Center. My question is, how can i go there? some says that from Alabang take Cubao bus then Rizal. and some say, take Mandaluyong. which one is the true? and which one is the short cut? We all know that "Laguna de bay" is the boundary of muntinlupa and Rizal. what if i ride a speed boat to rizal? will it work? and addition for that, how much will the fare cost?