Re. What bus goes to the East Point Business Park?
There is a shuttle bus from Clontarf DART station.
After that you're looking at Dublin Bus buses that go Fairview/Howth Road or Fairview/Clontarf Road, and walking the rest of the way.
The 130 goes from, possibly, Abbey Street and you'd need to get off at the stop opposite Fairview Westwood.
Alternatively, any of the Howth Road buses and get off at the first stop after Fairview.
From either of these stops, it would be about 20 minutes walking.
Oh, and I just thought that if you got off those buses at North Strand/Annesley Bridge you could walk down East Wall Road and along the Alfie Byrne Road.