There is no sand on the path to Heads up bar. The path starts at the second tram stop and goes past the Olaf Frozen stand, the bathrooms, and in between the snorkel trail on the left and the Pelican Plunge slide on your right. In fact all pathways around the beach are concrete. The only exceptions I can think of are the Serenity Bay Bar and Serenity Beach dining which is on a sanded area. The other possible issue might be the observation tower from the pathway to the tower, and of course the stairs.