hi sir, i have done this trip 3 times na, but from zamboanga and used the dumaguete route, so i can only answer some question
1. kaya po ng 4days yun one way trip, usually un bus kasi 2days 3 nights lng.
as per suggested sites, un aklan roro, sa caticlan jetty port un baba nun, so might as well mag boracay kayo saglit, then my favorite route is un bacolod to dumaguete, ang ganda ng scenery, if you could spare some time, pwde niyo daanan un bais sand bar, fyi. bais is a city along the bacolod dumaguete route.
happy trip sir