Outdoors Lovers (Belgrade)

I'm new to the area, having only been here about a month, but I have yet to be able to track down any sort of outdoors scene here. I'm wondering if anyone knows of an outdoors activities group I could get in touch with. Or if there is anyone on here who would be interested in some climbing, mountain biking or backpacking (of the camping variety) and/or maybe in teaming up for a ski trip or two once the snow returns. Thanks in advance for any help any of you can offer.