The Bluff gives this trail its first hard-edged feel, with Cap Jervis and Encounter Bay setting up the kind of sea-and-mountain running that makes you look up even when your legs would rather not. Cape to Bay - Ultra Hard Series sits inside the Ultra Hard Series, and the source is pretty clear about its personality: this is likely “the hardest course in the series,” aimed squarely at ultra runners who like their race calendar a bit rough around the edges.
Expect trail terrain, nature, coastal running, and climbing rather than a tidy road-day rhythm. The longer course carries serious elevation gain, so this sounds like one for runners who are happy hiking hard, managing effort, and earning the views that “will fill your eyes.” The crowd should skew toward people who already know what they are signing up for: big shoes, long hours, and a finish that feels better because the route made you work for it.