Not only is a kayak a great fitness machine but it gets me around the flat water rivers and lakes to enjoy and photograph their unique landscape, near on impossible otherwise.
With a cruising speed of around 50k/h on good going, the 4x4 bike and trailer carry photography gear, camp and tucker over considerable distances, allowing camping on site for the best light.
On the mountain bike I travel close enough to the ground and slow enough to see quite a bit that may otherwise be missed. Of course, the bike is mainly for travel on rural roads and tracks.
With a pack on my back, it's often not necessary to cover a great distance to capture the wilderness landscape. Anything from a few hundred metres to 15km can make a great day out in an isolated environment.