This has always been my passion - To be able to travel from city to city and spend a few days in each (or until you feel like a change!) - and supplement your travelling by trading the currency markets.
I've just been away on a long holiday over the Christmas period for my two months per year break and actually appreciated 'not trading' for a while.
I was still eager to get back into it when I got back though. It seems like the ultimate freedom, as all you need is a laptop with an internet connection!
The only thing you would need to be careful of is what time zone you are in and so what would be the best currency pairs to trade. You might need to get up early, or stay up late to catch the best, most liquid trading.
I haven't yet made the first move of taking the laptop on holiday with me, although it could easily be done!