Ireland is different to the UK in that there are virtually no public footpaths or bridleways outside of the national parks (which usually don’t allow cycling afaik). So the only option for mtb-ing here is basically to trespass, or go to a trail centre, but they’re all closed at the moment.
I’ve only ever ridden in the alps (3 times i think) and always worn a big silly helmet, and armour, looking like the world’s worst sweaty american football player. The rental shops basically wouldn’t let you take a bike without it.
Will do some more investigating, I know there’s a load of old MTB kit (and a dh bike) in the loft. could be my next project…