You get to it by turning right (coming from Lochmaddy) at the Co-op in Sollas. Follow the track down towards the beach. Just after you go through the gate, you'll come to a crossroads in the machair tracks - it's obvious which one you need to take if you think about it for a minute or 2! Keep going until you reach sand.
If you likr waves, you should kitesurf here. It's lovely. You can surf it in most tide conditions but be aware that you will have very little beach space at high tide.