No fancy tech - you pay with cash or cards like normal, so you need to go back to your locker to get cash/wallet when you need it. That said, you only need money if you want to buy food/drinks or souvenirs - you don't pay extra for the rides etc.

Yes, Siam Park in Tenerife still accepts cash in 2026, but the park is increasingly optimized for digital and cashless payments. You can use cash at the ticket offices at the entrance and in the various shops throughout the park. However, for internal convenience, many visitors use the park's RFID wristband system. You can "load" these wristbands with money (using cash or card) at the beginning of the day and use the band to pay for food, drinks, and lockers with a simple tap. If you have any remaining balance on your wristband at the end of the day, you can get it refunded in cash at the exit. While cash is accepted, having a card is often faster for the many kiosks and "all-inclusive" upgrades available at the world's top-rated water park.