Source for quality bike rentals

Hi all, we're coming down in August and need to rent a few bikes (beach cruiser types). Last time the bikes we rented were pretty low quality. They kept breaking down (or just didn't run that well to begin with). The agency was good about coming out and fixing/replacing them, but it was kind of a pain and we were hoping to find someone who just rented bikes that were a little higher quality this time. I think Rosemary has Giant brand, but I think you have to be staying there to get those. Thanks!