These fringe boards are hit or miss. Mostly miss. I've posted questions about airports under the Airports board and gotten very little action. But if I am flying AA and post the same under the AA board, I get way more response.
I'm doing a Big Island Hawaii stay in February. I've gotten some info from the Hawaii travel board but much more info from the Hilton board for the Hilton Waikoloa Village posts. I think you need to decide where the people are and post in the best spot.