In the past I've headed out early to Ramsey, watched for a bit there, then on to the Gooseneck, Creg or Hiilberry. Or on the other side. Back to Milntown, even Union Mills or Bradden etc. Traffic is easier on a bike I'd guess but if you're on a short trip or have itchy feet it allows you to view from lotsa places. Obviously you'll not get pole position view wise but there's usually a good spec to be found somewhere.
Hillberry behind the wall is always my fave.