When it's not hot AF I quite enjoy trail riding. I haven't been in two years though because it's quite hard to find that much free time (~4 hrs) when I have two kids under 6. I enjoy feeling the breeze as I ride, the constantly changing scenery, and the random challenges of rough terrain and steep hills. It's also quite fun to use GPS and map your ride and see the stats.
Kids definitely make things harder don't they? Mine are 2 and 5 and so even if we go out, they walk slow as shit, and if I turn up the intensity in hide and seek it's over before it starts. I like to think I'm essentially exercising most of the time though, because they can certainly get my heart pumping.