As part of a social program for conference I have the choice between: Saturday: 1) Causeway Coast, Glens of Antrim, and Bushmills or 2) Marble Arch Caves Tour Sunday: 3) Mount Stewart, Strangford Lough and Downpatrick or 4) Ulster American Folk Park and Beaghmore Stone Circles. I'm leaning towards options 1 and 4. Any advice? I also have a couple extra days before the conference... any thing I should make sure I do in that time? I've heard about the black taxi tours and I'll probably do that. Are options 2 and 3 worth doing on my own?