Congrats on the 28 mile ride! More than I could do this week. And unlike my ride, which was all flat, perhaps you encountered a few ups and downs?
It is a fairly hilly ride, mostly uphill on the way out, mostly downhill coming back. My pace is pretty slow, but I'm finding that I'm liking the up hills. This year I've been experimenting with a slower cadence and a higher gear, and that seems to be working well for me. I am more likely to feel repetitive stress on a flat ride.