Back to Nature
These provinces are reasonably quiet, although there are a few national parks to visit. The northwestern corner of Prachin Buri Province is part of Khao Yai National Park (see Nakorn Ratchasima), while Thap Lan National Park is about 30 km north of Kabinburi. The area really is untouched, with virtually no facilities at all. You can get camping permits from rangers at the park office in Thap Lan village, Na Di district. They can also organize trips around the park, but you have to arrange your own transport to the entrance.

Waterfalls
Pang Sida National Park is also worth visiting for Pang Sida and Na Pha Yai waterfalls close to the park office. Daeng Makha and Suan Man Suan Thong waterfalls are also worthwhile, even if they are harder to get to.

Khmer Connections
In Sa Kaew Province, probably the most interesting place is the frontier town of Aranya Prathet, once a regular flashpoint where Khmer Rouge fighters would cross back and forth into Thailand from Cambodia. In the north of the town, Talaat Rong Kleua bustles with Cambodian traders trekking across the border sell their merchandise. If you have a visa, you can take the train from here into Cambodia and on to Phnom Penh.