Papa Tom,
I just realized that I actually got some answers here. Thank you.
So we ended up renting in Northport ... which is even further out than Syosset

( My wife will be working in port Jeff)
currently I am still playing with ideas(in my head) to make biking part of my routine. We are moving in July so there is still some time left.
Here are current options:
1) Drive to Syosset, Bike from there to NYC using your suggested path -- on the way back take LIRR to Syosset and drive home -- I really would love to get some company on that ride for safety reasons.
2) Bike to Syosset, Take the train out to NYC. Problem is getting back -- a little worried biking at night through long island

-- this involves getting a foldable bike -- I heard "Bike Friday" can copy the geometry of a road bike....
3) Drive to some area in Queens Bike from there ...
Not sure -- really worried that I will stop biking ... need support .