The Ongkharak district is an important source of ornamental plants and cut flowers. At Khlong 15 on Highway No. 305 (the Rangsit-Nakhon Nayok route), there are many plant nurseries growing a large variety of annuals and perennials.
This is situated at the foot of Khao Changok, 14 kms. west of the town. It is conveniently reached by bus either from Nakhon Nayok or from Bangkok. Apart from the academic section, this place also offers a variety of attractions and activities. The shrine of Chao Pho Khun Dan and Wat Phra Chai are places of worship located in the compound. A golf course and shooting ranges can be used by visitors. Moreover visitors may enjoy a bike trip around the site or apply for canoeing practise.
Located 9 kms. south of the town on Route No. 3076, this is an ancient town of the Dvaravati period (about 6th-13th century). lts oval shape measures about 600 metres at the longest point. Religious artefacts including fragments of Buddha images, seals and ornaments found in the excavation are now exhibited in the Prachin Buri National Museum.
This temple is 5 kms. from the town along Route No. 3050. ln the compound, there is a memorial site for the Japanese soldiers who died during the Second World War.