It’s easy. Just follow these steps:

1. Visit the Viator website and browse for tours and activities in your destination.
2. Once you find a tour or activity you want to book, click on it to view more information.
3. Click the “Book now” button to start the booking process.
4. On the next page, you will be asked to enter your booking details, such as the date and number of travelers.
5. After entering your booking details, you will be taken to the checkout page.
6. On the checkout page, you will see a box where you can enter your promo code.
7. Enter your Viator promo code in the box and click “Apply.”
8. Your discount will be applied to your booking, and you can complete your purchase.