Hawaii Volcanoes National Park
Pets on a leash are allowed in developed areas of the park; including
Pets are not permitted in all of the undeveloped areas of the park, including
all designated wilderness and all trails
on Hilina Pali Road, including the Kulanaokuaiki Campground
Before You Go Exploring in the USA
For a discussion on state law regarding cats, see here.
Most locations require pets to be on a leash less than 6 feet long.
Typically pets are not permitted in public buildings.
Cats are welcome:
in developed areas
on many trails and campgrounds
in some lodging facilities
Cats must be restrained, either on a leash (not exceeding 6 feet in length) or caged/crated.
Pets are not permitted:
in public buildings
designated swimming beaches
Cats are allowed in national forests, but must be kept on leash (less than 6 feet in length) while in developed recreation areas and interpretive trails.
Cats are not permitted in swimming areas.