we just came back from a transatlantic with the Navigator otS and our first port was Santa Cruz, Tenerife. We took a rental car and drove to the Teide (highest mountain in Spain) and to Puerto de la Cruz, cost about 40 Euros (www.cicar.com
). It's a nice drive with a lot to see.
We were lucky to get one of the cars, it's better to reserve in advance, they are directly located at the port.