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• Tap water is safe to drink. Bring a refillable bottle.
• Take the train: high-speed AVE lines link Madrid, Barcelona, Seville, Valencia and more.
• Visit popular places early or off-season: Barcelona and the islands are very crowded in summer.
• Many cities charge a small tourist tax: it helps local services.
• Never leave rubbish on the beach and use the paper/plastic/glass bins (blue, yellow, green).
• Water is precious in Spain: take short showers, especially in summer droughts.