Check out the Khan Academy, a not-for-profit 501(c)(3) with the mission of providing a world class education to anyone, anywhere. This is a truly amazing site to learn Math, Science, Humanities, History, Finance, SAT Test prep, etc. The Khan Academy is 100% free to use and partially funded by the Bill and Melinda Gates Foundation.
This section is called enlightenment, because sometimes while on vacation you may want to explore things you might not come across at home. We have a cool community college on Stock Island, just 5 miles from Duval St., that offers courses throughout the year, some for only a day or two that might fit into your holiday schedule and satisfy an aching need to learn something about a subject you've been curious about. Check out the Florida Keys Community College continuing education course schedule for ideas on personal enrichment, they might include photography, pottery, diving, etc.