Who fixes the outbuildings,
Contracted out, if no one volunteers...and if they get fixed at all. One of the three bathrooms has been locked for months rather than fix the toilet.
trims the bushes/trees/
Contracted out to the same company the street department uses. No decorative trimming is done. If the trail starts getting overgrown, they have one of those boom type shredders that can tilt up sideways and mangle the trees into submission.
empties trash cans,
As I said above, the park maintenance employees, but there aren't that many cans, nor do they get checked multiple times a day. Give me a pickup and a roll of trash bags and I could get them all inside two hours, alone. They always have two people in the cab of the truck and another riding the tailgate doing the actual bag changes when they make trash rounds. Before you ask, they have a big dumpster by the equipment shed, so they're not having to drive it 6 miles to the dump.
picks up trash.
Volunteers, community service workers or they wait for it to wash into the river and become somebody else's problem entirely. Haven't seen a paid cleanup crew down there in years.
In the offseason who fixes the equipment, does delayed maintenance?
Machinery is done by the municipal service center or a local garage. Playground equipment is done by the contractor who put it in for liability reasons.