If you need a relay or help, call on 121.5. There is plenty of jet traffic above from/to Pacific Islands/US/NZ.
LHI NDB 272. DME also. LHI VHF ATC outlet 124.95. QLink 131.65 if staff are at the airport.
Good walks/picnics are to Transit Hill, the NDB, DME and ADSB site, and also the Catalina crash site Near Old Settlement beach.
A more difficult walk is to Malabar Hill, used by Coast Watchers during the war.
Good luck.