Will your "tip top condition" show up in the pictures? If not than don't waste sleepless night over it. Cameras are meant for usage, not for looking nice.
Whether Genting is more humid or not depends on the actual weather there. No point making a generic statement when the weather in mountain region can change within 1h from "dry&hot" to "heavy rain". Nothing to worry if you just go for a weekend trip, you can save the money for sucking hippos and other creatures, no point at all. Fungus needs more than a weekend at 2000m. Many people brought their cameras to places that were colder, more humid, hotter or otherwise more unfriendly to cameras - and they returned with lots of great pictures.
Go, enjoy, shoot, learn, enjoy, stop worrying.