skydiving	scuba-diving	
snorkelling	potholing / caving	
tennis	rock climbing	
yachting	water-skiing	
rafting	kayaking	
moutaineering	trekking	
hiking	survival training	
bungee-jumping	surfing	
zorbing	train-spotting	
stamp-collecting	fishing /angling	
paragliding	golf	
mountain-biking	camping