Kailua-Kona's only swimmable in-town beach is this teeny-tiny strand between Kailua Pier and Ahuʻena Heiau, where ocean waters are calm and usually safe for kids. Concession stands rent all kinds of beach gear. This is a pretty perfect spot for learning stand up paddle surfing, given the proximity of a) gear vendors and b) calm water. If you paddle (or swim) out past the heiau, waters get a little choppier. This is also a good spot to teach kids snorkeling basics.