We visited the garden on a friend's recommendation, not knowing what to expect. We had no car, but the website mentioned that if we phoned ahead, staff might be able to pick us up from the bus stop. That worked out well (details below).
This garden is a collaborative labour of love, sustained by voluntary workers from many countries to create a series of spaces celebrating the Celtic seasons along with the nature and lore of ancient people of Ireland. The different purpose-built structures on the little landscape have thatched rooves and are completely natural inside, giving the interiors a restful feeling. Outside was sometimes peaceful and contemplative, sometimes giving a sense of power. One thing we loved was the variety of seating options in various natural nooks outside, and the wonderful feeling we got sitting there reading.
We had no car. Buseireann 419 toward Clifden, departing from beside the Galway rail station, took us to the Roscahill Post Office stop, which is at the start of the road toward the gardens. (There is no post office any more!) As the website suggested, we had phoned ahead to see whether staff were free to come fetch us from the bus, and this they did (if one of us did not have mobility problems, we could have walked the two kilometers to the gardens from the bus stop).
Some gardens are a botanical treasure trove. This one was more about themes, shapes, trees, stones, and structures, although it certainly did have lovely flowers. The cafe inside was delightful ans reasonably priced, with fresh ingredients and original, varied dishes. There is also a little gift shop.