From the parking, head round to Hallow Bank - on the track you will pass one of Ull's marbles on the right-hand side. Go through the gate onto the fell, following the small rising path up and across the hillside. Shortly you will pass the remains of a large 'alley' on the left before reaching another one of Ull's marbles, a 'shooter', where the cache is hidden.
It's hard to imagine such a rough looking boulder in use as a round marble. What you see, however, is the result of weathering and exfoliation over many years, which has rendered the smooth orb into a craggy lump. At least that's what the legend says.
This can be approached either on the way up or down. The small path leads up to Kentmere Pike from where you can continue on a circular walk round to the Ull Stone and back via the other caches in the valley. Or do it the other way round. Or any other combination. Have fun however you decide to go! Remember to keep an eye out for other marbles - there are lots about.