What's fun to do while in Spain:

1. Yeah, you are right. Language would be fun, while a learning challenge.
2. Visiting beaches at South Tenerife, and a look at the Canary Island would be an ideal place to see too.
3. Island hopping, snorkling, surfing would also be great.
4. Being a nature lover, I'd like to comfortably stay in one place in South Tenerife. There's plenty of attractions to look at, but, better if you have a tenerife travel guide with you.
5. Engage in business, while in Spain. Heard Spain is filled not only with good attractions to see, but, also to look for business, say real estate devt. during your stay in Spain. In fact, I am checking property for sale in Tenerife, and who knows, I can find a small unit with a lower price.
6. Be sure your loved ones are with you to make the whole time enjoyable and remarkable!