Traffic was pretty minor before but is not so in Kona. Driving in tourist-oriented areas can be slow, but the town is generally not large enough to have serious congestion. Walking is a great way to move from place to place if you're taking in features of the town. But you should rent a car because there are some place where there is only lava.

There is great snorkeling at a local beach park called Kahaluu.   More...