Sex and the sound of the waves on the beach is very romantic! An additional stimulating factor is that you can be seen doing it in public.
Try to find a deserted place or a secluded harbor. You can hide behind a large stone, under a blanket or under the cover of night. In the latter case, remember that it may be cold at night even in the southern regions. Stay in your clothes or cover yourself with something warm.
We do not advise having sex directly on the ground or sand. It is better to do it on a plaid (the more blankets, the better) or a deck chair. Try not to get sand on the genitals or inside them, because then the juicy experience can turn into torture.