Weather is probably your biggest concern but realistically it shouldn't be too bad.So far this year it has been exceptional i wouldn't expect to see anything below 10c and certainly no frost.If the weather does keep good like this the countryside will be looking very good, growth has started well and it may be a
very nice early Summer.Best conditions for cycling.
Don't be shy about chatting to people or asking questions and you won't have any problems.
If you visit St James Gate it might be best to leave your bike somewhere safe and get there by bus (or walk).
I like County Wicklow, a trip out the Sandyford Road, Enniskerry Road, hrough Enniskerry, Roundwood, Laragh, Rathdrum, Avoca would let you see some nice quieter roads.