How worried should I be about snakes on hikes and what to do if bitten

Snakes are present but bites on tourists are rare because snakes avoid people. Reduce risk: wear closed shoes and long trousers on trails, stomp a bit so vibrations warn them, never put hands or feet into rock crevices or tall grass you cannot see into, and use a torch at night. If bitten: stay calm and still (panic speeds venom spread), keep the limb below heart level and immobilised like a fracture, remove rings/watches, do NOT cut, suck, apply a tourniquet or ice, and get to a hospital fast. Sri Lankan government hospitals stock antivenom and treat snakebite routinely. Note the snakes appearance only if safe; never try to catch it.