Holes 1-11 and 17-18 are playable (I didn't see a tee sign for #18, but you can just throw from #17's basket). #12 and #13 have no discernable fairway due to lack of maintenance, and I'm unsure if #12's basket is hiding there in the weeds or not. #14 and #15 have no basket. I couldn't find #16.
I'd recommend just playing #1-10 and then following the park road around to #17-18 for a 12 hole round. That way you stay out of the woods entirely.