West Malaysia spans Kuala Lumpur's Petronas Twin Towers and Batu Caves, George Town's UNESCO Peranakan shophouses on Penang, the Cameron Highlands tea plantations, and Langkawi's island duty-free beaches in the north.
Drier season for the west coast with George Town walking pleasant, Thaipusam at Batu Caves in late January-February with devotees carrying kavadi, and Langkawi at peak.
Pre-monsoon with KL hits 33°C, but Cameron Highlands at 1,500m altitude stays cool and the tea plantations at peak photographic conditions.
Drier window again with Langkawi at peak, George Town Festival in late August fills heritage shophouses with arts events, and Cameron Highlands strawberry harvest.
Wet shoulder with Northeast monsoon affecting east coast more than west, KL Deepavali lights through November, and Penang's Hokkien New Year celebrations.