I normally fight in urban, as most should know. Noticed not many players fight in multi-storey urban complexes. It's also interesting how different styles of fighting and tech development evolved in different environments, maybe I'll write my take on that some time.
Although I haven't fought in complete jungle before, the closest was a scattered tree type terrain surrounded by jungle. We've gone hiking through full jungle before, and I doubt it would be a very nice place to have a water fight. Assuming your jungle is big, you could get lost, attacked by snakes, insects and if you stumble into a swamp, crocodiles. General atmosphere isn't good either, mosquitoes, humidity, snagging undergrowth and things with many more legs than you. We've also managed to get into low-level army training areas by bashing through jungle, and found some empty M16 and GPMG rounds on the ground.
118th Urban Corp
Adeptus Exterminatus Extremis, Noobis Exitus Proxima