Agree with most monocock says apart from "needling nothing".
The following I find comes in handy :
Wheelbarrow
A couple of spades and rakes
A wee tractor of at least 50hp
A finishing mower
A topper
A grass aerator Is handy but not mandatory
A little grass sowing machine to either push or pull behind the quad
A small set of harrows
A small roller
A decent local golf course mechanic or Ag engineer that does not charge you like a wounded buffalo to sharpen up the finishing mower a few times a year.
A couple of bags of grass seed for repairs/patching(not stored in the hangar attracting mice)
Kids or nephews or local youths that drink and smoke but can't afford to pay for it as a cheap supply of manual labor
A couple of rolls of drainage pipe and a pile of backfill for the areas that don't drain so well.
That's about it.