Mountana Mountain is a mountain biking mecca and people come from far away to ride these beautiful trails. Be warned though, that this is not the best place for a beginner rider. The riding is technical and steep in places, but there is plenty to keep the comfortable intermediate busy. For a longer ride, ride Mc Donald Creek or Nares View. For a quick afternoon ride we like to combine Maggie's Run, Sporting Wood, upper Dei Kwan, Sam McGee and AK DNR (then Mossy all the way to the beach on a nice day). Another good combo is Holey Roads, upper Dei Kwan, Lower Wolverine and Fox. Upper Wolverine will delight the more advanced riders, so will Black Bear and Goat. You can shuttle up or ride the nice uptrack (or do a bit of both!). Get more info on the trails here.
There are two places to camp in the area (on top of an ugly pricy RV park): the Carcross campground is right in town, but in a nice wooded area (that's where we like to stay, riding and walking distance from everything, good cell signal, free wood, included in our Yukon camping pass). There is also a new territorial campground 10 minutes out of town called Conrad. It's also treed and more quiet, but there is no cell signal and you need to drive to get anywhere.
There is the famous Carcross desert where every tour bus coming from Skagway (AK) stops, but there are also some beautiful (and hard!) hiking trails that rewards you with beautiful views of the area after only 10-15 minutes of hiking (no need to go all the way to the top, but we highly recommend it!). I especially recommend you hike Nares Mountain, Caribou mountain or Sam McGee (also called Mountain Hero), 2 km passed Conrad Campground. Bring your bear spray and make lots of noise, we have seen bears on these trails every year we came to hike them.
Carcross is a really cute little town with one of the most beautiful (although often very windy) beaches in the Yukon. The new Carcross Commons is a cluster of tiny houses with Tlingit-inspired facades featuring artisans, an amazing coffee shop, a gelato shop, an authentic maple products shop, a bike shop and lots more. There is also a delicious restaurant called The Bistro.
There isn't much in terms of supply in Carcross. A corner store with pricy crappy food, a laundromat at the RV park (and that allowed us to fill our water jugs there) and dump and fill for $10, no propane, so make sure you come prepare and grocery shop in Whitehorse before coming.
By the way, for those interested, I think my love affair with the Fujifilm x-100t is already over. I miss the bokeh of my Nikon 24-70 mm (on the D700). I know I cannot ask this little camera to do it all well (as my friend Michel says, it's not a grand piano, it's a synthesizer, it doesn't do everything, but what it does, it does well). It's a great second camera, but since I cannot afford 2 cameras, I'll go back to my super heavy work horse. Maybe the xt-1 + the 56 mm f 1.2 would be the answer, but I would need at least another lens (23 mm?), which adds up...