Unofficial temple donation book
Low severity
Someone posing as temple staff may present a 'donation book' with large amounts already listed, implying that's the expected sum.
How to avoid: Kelaniya Raja Maha Vihara does not require a donation to enter. Give only if you want to, and only at the official collection box.
Inflated fares from Colombo
Low severity
Tuk-tuk and taxi drivers picking up in central Colombo sometimes quote several times the metered fare for the short run out to Kelaniya.
How to avoid: Use a ride-hailing app (PickMe, Uber) for a fixed, metered price, or agree the fare before getting in.
Unsolicited mural 'guides'
Low severity
Men loitering near the temple's mural halls may attach themselves to visitors and demand a fee afterwards for an unrequested explanation.
How to avoid: Politely decline if you haven't asked for a guide, or agree a price up front if you do want commentary on the Ajanta-style murals.