It is a lively market town along a stretch of the River Nore which is known for its salmon and trout, with a number of historical landmarks in the vicinity. Visitor attractions include Jerpoint, Kilfane Glen gardens, and Mount Juliet Golf Course.
The town was founded in the 13th century on an important crossing point by an Anglo-Norman mercenary from Wales, Thomas FitzAnthony, replacing the earlier Irish settlement of Grennan (Irish: Grianán, Sunny Place).
Milling, with mills powered by the waters of the River Nore, was the principal industry in the town until the early 1960s. The mills were Pilsworth's Mills. At one stage there were 12 water-powered mills, for grain and cloth, working in the parish. The last working mill in Thomastown closed in 1963. This mill is now the site of Grennan Craft School. Several mill buildings in good condition can be seen upstream from the bridge.
For centuries there was an important boat trade to carry produce to and from the port of New Ross. It went into decline at the end of the 18th century.
The cache is hidden down a small side road that leads down to the river and the old mills. It is a small glass container.