Activities include backpacking, canoeing, canyoning, caving, climbing, hiking, hill walking, hunting, kayaking, and rafting. She enjoys paragliding, surfing, boxing, canyoning, mountain biking, diving, skiing and mountaineering. Adventure sports such as base jumping, paragliding, canyoning, rock climbing, bungee jumping, etc. Examples include white water rafting, paragliding, canyoning, base jumping and more genteelly, orienteering. In summer, the main activities are hiking, climbing, mountain biking, 4x4 trails, and canyoning. Other popular activities include canyoning and mountain biking. Sea kayaking, tramping and canyoning now attract many thousands of visitors each year. Many caving skills overlap with those involved in canyoning and mine and urban exploration. The word is used in a similar sense to canyoning and canyoneering. Specialist canyoning boots offer an expensive alternative to Wellingtons and hiking boots. In most parts of the world canyoning is done in mountain canyons with flowing water. Portugal also has canyoning in the Azores and Madeira. A potential danger of many canyoning trips is a flash flood. The number of countries with established canyoning outfitters is growing yearly. In Japan ("sawanobori") and Taiwan canyoning is called "river tracing" and typically involves traveling upstream.