I'm putting a reference here, naming provinces that we have not yet visited together in Thailand. The full details can be found here, but the listing below is just shorthand to suggest new provinces we might want to visit in 2019, if they turn out to be nearby, or are on the way to somewhere else we are going. Many may be ones that we'll be unable to visit this year. But I'm thinking we will likely make it to some of the Central Provinces and for sure the last one in the Northern Province that we've not yet visited. So far we have been to 33 of the 76 provinces, plus to Bangkok, of course.
Nakhon Nayok, Nakhon Pathom, Pathum Thani, Prachin Buri, Ratchaburi, Sa Kaew, & Saraburi.
Chanthaburi, Rayong & Trat.
Phichit