While my circumstances don't mirror the OP's circumstances, we used to have a home on 5 acres that had a pond. We purchased a Craftsman garden tractor with hydro-static drive that allowed one to really go slow. When I first went to mow around the pond, I tried following the online advice to always mow up and down the slope. Sadly, our slope was steep enough that I was never comfortable with driving down the slope and being sure of turning before going into the pond.
My solution was to drive horizontally across the slope, and when near the pond, I went as slow as that tractor would go. And, just to play it safe, I always mowed where I was free to jump off away from the pond just in case. Never had a problem mowing that way, but the wife refused to EVER watch me mow around the pond.
Nowadays, she almost refuses to allow me to get close to cliff edges to take pictures. When we were at Toroweap Overlook at the Grand Canyon, the wind was pretty strong, and she wouldn't let me get within 20 feet of the edge.
My solution was to drive horizontally across the slope, and when near the pond, I went as slow as that tractor would go. And, just to play it safe, I always mowed where I was free to jump off away from the pond just in case. Never had a problem mowing that way, but the wife refused to EVER watch me mow around the pond.
Nowadays, she almost refuses to allow me to get close to cliff edges to take pictures. When we were at Toroweap Overlook at the Grand Canyon, the wind was pretty strong, and she wouldn't let me get within 20 feet of the edge.