You do not strictly need to bring your own towels to Siam Park in Tenerife, but doing so will save you money. In 2026, the park offers towel rentals for a fee (usually around €5 per towel) plus a refundable deposit (usually another €5). If you are a standard ticket holder, these costs can add up for a large family. However, if you purchase an All-Inclusive Ticket or a VIP Cabin/Villa package, towels are included as part of your premium service. For those on a budget or staying at a nearby hotel in Costa Adeje or Las Americas, it is very common to bring a lightweight travel towel or a hotel beach towel. The park provides ample locker rentals where you can store your towels and dry clothes while you are on the slides. Keep in mind that for the "Tower of Power" and other high-speed slides, you cannot wear or carry a towel with you; it must stay at your "base camp" or in a locker. Most visitors find that one large towel per person is sufficient, as the Tenerife sun dries you off quickly between the lush Thai-themed attractions.