We also had an abundance of Acorn squash piling up... we decided to
(once again) grill them.
It ended up working out great. I made a quick butter, brown sugar,
and thyme baste. We cut the squash in half, seeded them, and then
brushed on the butter sauce. Put them on the grill, flesh side up,
and let them stay there with low heat for about 45 minutes. About
halfway through, I reapplied more of the butter sauce.
They turned out great, and it was very simple to do.