I've been to the Slieve Bloom mountainbike trails - on the Offaly side mainly - starting off from Kinnity Castle carpark.
Speaking of Kinnity, and Google Maps, if you are around them parts again, one thing you could check out is Irelands only pyramid:
https://www.google.com/maps/place/Kinnitty+Pyramid/@53.0961733,-7.7204277,193m/data=!3m1!1e3!4m6!3m5!1s0x485cffb2d679e46b:0x298d9c1759b54c2!8m2!3d53.0961676!4d-7.7199457!16s%2Fg%2F11c534f03x?entry=ttu
Built as a family tomb, by the then owner of Kinnity Castle.
There are walking trails as well as the mtb ones starting from Kinnity Castle