Tibidabo really is an old park, but it's a symbol of Barcelona.
Some of the rides are almost 80 years old and it's amazing they are still there! (By the way, Tibidabo is now the oldest amusement park in Spain, after the first one, located near Tibidabo, disappeared back in the 1920's. There is some vintage footage of that park, too).
I used to enjoy Tibidabo a lot when I was a kid, since the first theme park we ever had in Spain was Port Aventura back in 1995 (and it didn't even have half the rides it has today!).
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Regarding Furius Baco, let me point out that the monkeys are NOT drunk. Actually, it is only ONE monkey (called "ManĂ s"), which is the inventor's assistant. And I can assure you that monkey is not drunk because I've never ever seen a drunk monkey riding a bike... yet...
For those who have been there, you may have seen that comic strip story outside the ride and inside the queues building. There you have the story behind Furius Baco, which is unfortunately only in Catalan and Spanish, but that I could translate, if anyone is interested.
Will