Horse Riding in St John's, Antigua

Hello

Hubby and I are going to be in St John's, Antigua during our cruise next month.

I am a keen horse rider and would love to ride a horse on the beach.

The ship has an excursion on offer however seems very expensive and I wanted to find out the likelihood of being able to arrange something myself?

Does anyone have any contact details for any stables or have any information on local companies which can arrange? Or just any experience of riding in the area in general?

Thanks in advance :)