The Kids will have no problems in Puerto Rico: there are many good bilingual schools such as Robinson,St. John's, Baldwin, American Military Academy, TASO, Notre Dame,(just to name a few) where they will meet children from Puerto Rico and all over the world. Teaching is primarily in English but with the Puerto Rican experience. They will also love the fact that they can swim 12 months a year. Check out  and  for tons of things to do in PR.
As far as you and your husband are concerned, ask your husbands company if they will provide a one day or two day Cross cultural training or orientation; I work with several relocation companies who provide this service to incoming or outgoing exces and their families to ease them into life in Puerto Rico. I facilitate a lot of the training for major pharmas and for the most part, the assignees appreciate the info.
Come, it will be a great adventure.Â
By the way, if you are bi lingual most spanish spoken in Puerto Rico is NOT standard Spanish: for example if you ask for a glass of Jugo de naranja.... you will generally be greeted with blank stares and immediately labeled as a gringo. Here we call it JUGO CHINA (no di either).... it is believed they took the name from the labels on the orange bags which were imported from China way back when! Even the juice cartons call it CHINA!! also no Puerto Rican pronounces the S in any word...you'll adjust. ;-)