Bali's rainy season does not mean adventure stops. It does mean conditions can change faster, trails can get muddier and water-based activities may depend more heavily on real-time safety decisions by the operator.
Rain can make an ATV ride messier rather than less interesting. Mud, puddles and wet jungle trails are part of the appeal for many riders. Bring a complete change of clothes and do not dress for dinner immediately afterwards.
Water levels can change with rainfall. The professional river operator makes the final safety decision based on actual conditions. Ayung remains the easier recreational option; Telaga Waja is the more energetic route.
Canyoning is especially sensitive to water flow. Route availability and difficulty can change with weather, and the operator may modify or cancel a route when conditions are not safe. Never choose a harder canyon simply because rain makes it look more dramatic.
Choose a Bali canyoning route by difficulty.
Wet terrain changes traction and can increase the technical difficulty of forest sections. Rider experience becomes more important when conditions are slippery.