For many people, the answer to both of those questions is yes. If not "more dangerous things" then certainly more frequent activity then they would do at home. Hiking, swimming, sailing, tennis, golf, windsurfing, skiing..... the list goes on. A holiday also often involves a combination of such activities with more relaxed periods of time, nice meals out etc.
Now, factor in that most watch enthusiasts would choose a watch from their collection (however modest) to suit their activities when at home and the "challenge" for a holiday, to avoid taking mutiple watches, is to find one that does lots of things well. A holiday watch, if you will
And when I say "challenge" I mean a fun little game that we like to play as an excuse to sort through the collection, buy a new strap or two, maybe even a new watch.... and most importantly, talk about it on a forum