It's well worth the trip to San Cristobal de La Laguna, west of the city, because this singular structure offers one of the most interesting cultural visits on the island. Here it's all about "interactive'', because the idea of the museum is to teach through experiments and activities - brilliant not just for the youngsters (who can be kept entertained for hours) but for anyone interested in science. One of its central attractions is the planetarium, which takes you across the universe via cool holograms. Other areas not to miss include the labyrinth of mirrors and a whole section devoted to the human body. If you're planning a visit, keep in mind that, as in the island's other museums, the entrance is waived on Friday and Saturday afternoons.