Paper wasps are territorial but generally attack only if their nest is threatened. They can produce quite painful stings, nearby nests generally present an unnecessary hazard.
Black and Yellow Mud Dauber Wasps are the most common Mud Dauber found in Hawaii. The females build homes out of mud, usually in corners, cracks & crevices. They typically have more than one nest, each containing one egg, clumped together. Like many wasps, they are predators but are not typically dangerous or aggressive unless handled. Adults feed frequently on flower nectar, but stock their nests with spiders, primarily black and brown widow spiders, which serves for food for the offspring.
Carpenter Bees make their nests & spend most of their time traveling between the nest and the flowers from which they obtain food. If you see a number of large bees hovering near the eaves of the house or drilling in wood, you may have carpenter bees. The males hover in the vicinity of the nest and will dart after any other flying insect that ventures into their territory. A common behavior of the carpenter bee is to approach people if they move quickly or wave a hand in the air. They may even hover a short distance from people causing unnecessary panic. The male bee is unable to sting. The female however, is capable of stinging but seldom does. She must be extremely provoked before she will sting.
Carpenter bees do not eat wood. They excavate the tunnels for shelter and as chambers in which to rear their young. They usually attack objects such as doors, windowsills, roof eaves, shingles, railings, telephone poles, and sometimes wooden lawn furniture or décor. A carpenter bee begins her nest by drilling a nearly perfectly round entrance hole (about 1/2 inch diameter) into the wood. Bee Jars are used to deter these bees from causing damage to structures. Some customers have had tremendous success with these jars. Their effectiveness, however, is not guaranteed.