Wheres a good spot to take family to in NYC ? ( Activities )?

my younger brother and sister ( 20 and 17) want to go out and do something fun.

Im 24 years old, and i feel bad cuz they dont do much. they enjoy anything ! even walking around in timesquare like wtf !!??

Any fun ideas ? stuff like bowling, skating, arcades ? but we aready did those in the past.

Thanks in advance and every comment matters to those poor little kids, make there day :)