i would say that's way too packed to be feasible much less make it enjoyable. Also, I would do the SI Ferry first because that's the one that's out of the way. Once you get that out of the way you can head back to Central Park Zoo (Bowling Green on the 4 and 5 train to 59th St. will probably be fastest, although if on a weekday, R from Whitehall to 5 ave will save you some walking), then head south to FAO Schwartz, the Rock, and if time allows, Toys R Us. FAO and Toys R Us are similar enough and I think FAO is more unique except for the mini ferris wheel. Well, they also have a big video game section.