Hua Hin: 
City tour / elephant camp / night market / weekend market - water park - vineyards - waterfall - monkey temple

Petburi:
Cave - royal palace on the mountain with far-sightedness

Sam Roi yot:
Phraya Nakhon Cave - National Park

Pranburi:
Weekend market with music and food - Forrestpark (mangroves) - various beautiful temples in the area - white sandy beaches 

Kui Buri:
National park with elephants and buffalo