Absolutely! Crete is an amazing island and I am sure you will enjoy every single moment there. Let's start with family horseback riding activities: I recommend an amazing place in Heraklion called the Riding Academy. The horses there are well trained and the Academy has a huge area for you to explore! You can check it out here: Riding Academy of Crete | Kids Love Greece and let me know if you have any further questions.
When it comes to diving, Crete has one of the best sea beds in the Mediterranean that your husband and son can explore (and maybe you can take a course?). Crete also has many wrecks that are accessible to divers! Perhaps this could be of interest to your active family? Check here: Shipwrecks open to recreational divers in Greece (kidslovegreece.com) and let me know if you need more information about it.
In any case, after exploring the blog posts I shared, leave me an email at info@kidslovegreece.com and I will be more than happy to organize both adventures for your family.
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