Costa Rica has an amazing diversity of reptiles from which there are only 2 species of crocodiles, about 70 species of lizards, 14 species of turtles and more than 200 species of snakes. Most of the snakes are not venomous but there are some really dangerous species as well. :-(
There are 3 families of venomous snakes. Viper family has 12 poisonous snakes like the fer-de-lance and the bushmaster.
At the hight where we live it is extremely rare to find snakes but of course it is always advised to be careful on any trails.

Never go alone after dark and even during day on the trails and be very careful where you step, what you touch! 
At our high elevation there are only a few lizards and geckoes. At lower elevation there are plenty of iguanas, basilisks which are also called Jesus Christ lizards because they can run on the water, gekkos and common lizards. Quite easy to see them and they can be really decorative. Iguanas you can spot on the trees or on flowery bushes. Basilisk lizards are more secretive, more dificult to see them and are very attractive.
There are only 2 species of crocodiles in Costa Rica, the American Crocodile and Spectacled Caiman, but none of them lives at high elevation :-). There is a funny saying, that if you are not sure which one you encountered then check if it runs away, if so it was a caiman since they are quite shy, but if it tries to eat you then unfortunately it was a crocodile... So better keep a distance! :-)
In Costa Rica there are 5 species of sea turtles nesting on the beaches!! Unfortunately all the species of sea turtles are in risk of extinction despite in CR they protect their nesting places.

• Anoles: Many endemic species, often found in cloud forests, like the Talamanca Cloud Forest Anole (Anolis alocomyos).
• Galliwasps: Glass lizards and their relatives, including the Lesser Mountain Galliwasp (Celestus orobius).
• Geckos: Pygmy geckos (Sphaerodactylus) also inhabit these areas.
• Iguanas & Basilisks: Green Iguanas and various Basilisks (like the Green Basilisk) are common in lower, wetter zones.
• Salamanders: The unique Bolitoglossa bolanosi lives in high-altitude mossy areas. 

• Colubrids: Forest Racers (Dendrophidion crybelum) and various small earth snakes (Geophis spp.) are present.
• Vipers: Venomous snakes like the Eyelash Viper (Bothriechis schlegelii) are found in the humid forests.
• Coral Snakes: The Costa Rican Coral Snake (Micrurus mosquitensis) can be found in leaf litter. 

• Turtles: Various freshwater turtles, such as the South American Snapping Turtle (Chelydra acutirostris) and Mud Turtles (Kinosternon leucostomum), inhabit ponds and rivers.
• Caimans: Crocodilians are present in the rivers and lakes of the broader region. 

• Cloud Forests & Páramo: High-altitude zones yield unique amphibians and reptiles like specific salamanders and cloud forest anoles.
• Lowland Rainforests: Expect more common tropical species such as Green Iguanas, Basilisks, and various frogs and snakes.