The Heroes' Pursuits: For The Goddess Glory - Skellige
On Skellige all of the Heroes Pursuits quests can be started by visiting the Larvik Notice Board or by speaking with Svana in Larvik. You can also speak to any of the Race Masters (all of their locations are shown on the pages for these quests). Each of these quests are related and they basically form one long chain.
The Heroes Pursuits: Fyresdal, The Heroes Pursuits: Kaer Trolde and The Heroes Pursuits: Fayrlund are the first three of the chain. Beating all of them will unlock the final quest in the chain, The Heroes Pursuits: For the Goddess Glory.
For this quest you'll need to travel to Larvik and speak with Svana outside of the town. She'll give you your final quest which is a short race across the island to Freya's Gardens. It's likely that with good gear on Roach you won't even run out of stamina during this race.
For the Goddess Glory Rewards: Zerrikanian Saddle, 50 Crowns and EXP