I ride a pugsley or moonlander in the forests of UK. With the right tyres (nates) these things excel in the mud. Looking forward to the delivery of the new moonlander mud tyres (bud and Lou) Charlie the bikemonger getting some in soon, although they may all be pre-orders. Through the summer, riding with endomorph and larry’s instead of nates, is superb. Your only pain is getting your tyre pressures correct, once correct you just clatter of anything in your way. Forget worrying about the correct line, just ride over it.
I have ventured to the beach a number of times which is great fun.
So in summary, fat is superb in the forests. Just get your tyre selection sorted.