You do not strictly need to take your own towels to Siam Park in Tenerife, but it is highly recommended to do so to save money. In 2026, the park provides towel rentals for a fee (usually around €5), plus a refundable deposit. If you are a high-spending visitor booking a VIP Cabaña, Villa, or the Champagne Club, towels are provided for free as part of your premium package. However, for standard ticket holders, bringing a light microfiber travel towel is the "pro-tip" for 2026, as it fits easily into the lockers. Speaking of lockers, they are also available for a daily rental fee and are essential for keeping your dry towels and clothes safe while you are on the rides. If you forget a towel entirely, you can purchase themed souvenirs at the Floating Market shops near the entrance. Note that the park's "Mai Thai River" is closed for maintenance until March 11, 2026, so you might spend more time at the wave pool, where a good towel is essential for relaxing on the sun loungers.