Gravel Riding in Coastal Areas?

[Retinadoc]

I have tried this on a hard tailed mountain bike with very mixed results. Inevitably, I hit a pocket of deep loose sand and down I go. Not a big deal as I am usually going much slower than the guy in the video and the landing is soft.

Although the scenery is beautiful, I have found that I am so concentrated on not taking a major header that I barely have time to look up. Any tips on tire adjustments/brands for increased stability, or riding technique?

https://www.youtube.com/watch?v=_tyvP5eU6xA