[>BKA< T Wrecks]

@ SoUlFaThEr: I went to "your" old site counter-strike.net, had a look at the map archive, and since I figured out that the newest maps would be ones where nobody has a WP yet, I told the archive to show me the most recently added maps... cs_waterside was one of the maps it came up with...
Oh, btw: Did you ever waypoint de_vine? If so, I know I can spare me the trouble, cause the WP I have sucks, and otherwise I'd make a new one.

@sPlOrYgOn: Not only. In CS 1.5 it was a great PITA to make rain or snow. I think you had to place entities for every single place where a raindrop would fall, or something like that - anyway, loads of work. Ever noticed how in cs_ghosthouse it was raining in front of the house, whereas on the terrace on the rooftop there wasn't one raindrop? I guess that's because the mapper either forgot to make all those entities or got tired...
Now in CS 1.6 it seems to be much easier - look at the new de_aztec version. It's raining all over the map. And in cs_waterside, there's exactly the same rain. And in de_indust as well. And in cs_mopo3 (all new "1.6" maps) it's snowing. If you play these maps with 1.5, you won't see any rain or snow, because this feature is missing in 1.5.
But basically you're right, you can run all "1.6" maps under 1.5, of course.