Hi,
Speaking the language of the country is a valuable asset and highly recommended. Learning a new language is also one of the most powerful brain stimulants there is and has excellent benefits. I live on Roatan and it is an English speaking island as it's history is primarily British, unlike the mainland. You don't need any Spanish to live here and English has become much more common than it used to be on the mainland. That being said, acquiring at least a basic knowledge of Spanish would be smart, and fun. There are a number of Spanish schools in the country. On Roatan Kelly McLarnan runs The Language Loft which has great reviews.