Alright fellas, what kind of regular maintenance we getting into this weekend!
I always learn something from these threads.
Me: putting new mulch and pulling some weeds/grass around a bunch of seedling oaks and hickories I planted last fall to make sure they can get/keep enough water through the summer.
Also: replacing the whole-house filter.
If there's time (there won't be but a dad can dream): flushing the tankless water heater.