Dublin is a good trip. Are you going to fly to Weston? it is a hell of a lot cheaper than Dublin Airport and about the same distance out of Dublin, althoug the cab ride will be quicker due to the route.
I went to Dublin from IoM during TT for a day, I landed at Weston and the landing fee was 15 euro.
As far as routing go goes the best route where the chances of being vectored are slim is to the north and west of the Dublin zone. Any other route will give you a high possibility of being vectored.
If you do go to Weston be very carefull not to bust Dublins southern zome border and be even more careful that you dont bust the northern border for the military restricted zone.
If you check Westons website you can down load the VFR chart for the airfield and the VFR routes.