I arrive KIX on TG 672 @ 13:45 and depart for GMP on OZ1155 @ 20:25. I'm on a single ticket, and expect to check bag through from BKK to GMP.

I've got Priority Pass, and am on a J ticket, but the lounge options at KIX don't look super-exciting.
Any advice on how far afield to go for this long layover? It'll be in February, so wandering outside may not be as appealing.