If you want to shoot in full sunlight an use speedlights to light your subject, here are a few tips:
Whenever possible, I place the subject in a shaded area. This gives me much more control over the light on the subject, as I set my initial exposure at 1 stop underexposed on the background. In this case my exposure was ISO 100, 1/250 @ f/11. At this exposure, the subject will be in shadow, giving me a good canvas to add light to the subject.
For this shot, I placed the surfers under the shade of palm trees. As you can see in the video, both the mainlight (with the traveller 8 Softbox), and the rim light (with a Speed Grid and CTO Filter) is placed very close to the subject- between 4 and 5 feet. Both speedlights were set at full power.
The traveller8 gives a nice even, soft light on the subject, and adding the Speed Grid with the CTO filter simulates a warm sunset light on the right side of the surfer.
Modifiers used on this shoot: