Airport Express Tourist pass or octopus card in Hong Kong

I plan to visit HK in March 3rd week with my family and spend there 3 days. I wish to visit NP 360 and Peak tram on day 1, Ocean park on Day 2 and disneyland on Day 3, plus visits to few local site seeing events including Star ferry 8:00 pm on Day 2. My question is, for such trip, would AETP for 220 HK$ make more sense or should I go for an Octopus card. My quick estimates using Octopus card on MTR / Bus routes work out like this:
To n Fro Airport transfer using bus: 80 HK$
To n Fro NP360: 42 HK$
To n Fro Ocean Park: No idea as I may have to take MTR & then feeder bus
To n Fro Disneyland: 42 HK$
Local trips for 3 days: 30 HK
Based on above, I feel AETP (220 HK$) may make sense for me. Please corroct / guide if u have a better way of commuting in HK.

Further, pleaseinform if AETP can be used for MTF feeder bus like from Central station to Ocean park.