The highway into Ha Tien is as pretty as any in Vietnam.
When the red dirt road was smooth and flat, it was heavenly motorcycling: endless rice paddies, thatched village huts, the Gulf of Thailand, small groves of forest, and bursts of limestone hills.
War with Cambodia was a recent thing, and the border had not yet opened. Likewise, travel to offshore Phu Quoc was not permitted. Those two changes should have brought larger numbers of visitors to the town, but I expect it remains off the radar of most visitors.

Vietnam's southern coast road from Rach Gia to Ha Tien and the Cambodian border is possibly the most scenic in the south.

Ha Tien was the end point for me and my trusty Russian motorcycle on a month trip through the delta. No, that is a Honda.

This is actually the main highway, not some minor side road. Most parts of the dirt road were actually great for riding.

Ha Tien of course is a fishing port, but since my visit, has been a jumping off point to nearby Phu Quoc island.

Attacked by Khmer Rogues forces in the late 1970s, Ha Tien was behind even the rest of Vietnam in development.

I believe that (pre-covid) onward travel to Cambodia was made possible in the 2000s. This would be a great route.