Re: Co hosting in Hilo Hawaii
No, there used to be one in the past, but not anymore.
You can search the listings/hosts in that area on Airbnb and then try to locate them on Social Media for easy approach. Sometimes there are facebook groups.
Sending a "commercial" message via the "contact the host" link on a listing is mostly not appreciated.
A simple search on Google showed me already several Airbnb hosts in Hilo Hi ,also having a facebook page.
And you can ofcourse promote yourself as a co-host on same media