If anyone is looking for pants that resist liquids, have good flex, travel well, and still have a fairly trendy cut to them, check out the Levi's commuter pants/gear [1]
I'm a bit of a trendy fop and I love them. The fabric has a bit of spandex in it, which makes them super comfortable and flexible. Even though they have the spandex, though, they also have a normal/natural sheen, so people will just think you're wearing regular slacks and not space pants.
They're made for cycling, and they also work pretty well for that, as well (which is really where the give of the spandex shines).
They run about $80 MSRP
If you want to spend an unhealthy chunk of dough, and get pants that are pretty much amazing, you should check out the Outlier OG's [2].
Again, they're designed for cycling, but they're made out of a straight up tech fabric called schoeller dryskin [3]. They're relatively water resistant and dry really quickly when they get wet. The fabric has a nice give to it, and is comfortable. Those would set you back about $180, though.
I'm a bit of a bike nerd, and do a lot of commuting by bike. Toured ireland for five or six weeks as well. I also like clothes with a good cut. I've found cycling clothes like that tend to offer a lot of functionality that makes them good travel attire and there are a number of companies out there making things with a good cut to them. Like I said, though, I'm into feeding my foppish vanity; If you're not, well, more power to you :)
[1] http://us.levi.com/family/index.jsp?categoryId=11844101
[2] http://shop.outlier.cc/shop/retail/new-og.html
[3] http://www.schoeller-textiles.com/en/fabric-groups/soft-shel...