i'm in the same shoes.
always a hrh fan, rph virgin but staying there first time this fall.
i posed this question before like you have and found out it is about a 7-9 minute walk to the parks. the walkway empties out by margaritaville in city walk. you would be very close to IOA then.
someone told me the boat is not the best choice if you have just missed it. meaning, if the boat is leaving the dock as you walk up, it could be a 20 minute wait for it to come back. better to walk then.
also, tower 3 is closest to the water taxi
tower 1 is closest to the walk way.
i think it is robvia that has the links to the park walkways from rph. pull up one of his links and view it. (hope i have the correct poster for that)
options : boat/bus/walk
i plan to do the water taxi if it is there. if i have just missed it, then i wil walk