A medium-size turtle crossing a dirt road a day after a very heavy rain.
I checked with Gerardo Chaves ("Cachi") at the UCR after, and he confirmed the species is Rhinoclemmys pulcherrima.
Malayan Flat-shelled Terrapin (Notochelys platynota) in Singapore Zoo ©Tan KH
Asian Leaf Terrapin (Cyclemys dentata) in Singapore Zoo ©Tan KH
Malayan Box Terrapin (Cuora amboinensis) at Springleaf ©Tan KH
hatchling, found in a small water body in the middle of the forest