The Heroes' Pursuits: Fayrlund - Skellige
Quest Giver: Larvik Notice Board/Svana or any of the Race Masters
Other Requirements: N/A
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 (this quest) 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.
As for this specific quest it begins east of Fayrlund, speak with the Race Master (pictured above) to accept the quest. You will be racing Red Rikka who is a faster opponent but she goes off course at times which gives you the advantage. The route you'll be following is a straight shot (as shown by the screen shot below) so you don't have to worry about any sharp turns with Roach.
Reward: Zerrikanian Saddlebags, EXP and Crowns