Our guide was very informative. Nice cruise, even in the rain :-)
Cruise gets you very close to "Lady Liberty" so no need to visit the island, unless you plan to spend a lot of time there.
FYI... The crown on the statue is not open to the public until further noticee, so if this is your reason for getting off on the island, take this cruise as an option.
You will also get a close up of the Brooklyn Bridge.