Hat Yai is a city in Thailand that offers a variety of activities and attractions for tourists. Here are some of the things to do in Hat Yai based on the search results:

1. Visit the top attractions: Some of the top attractions in Hat Yai include CentralFestival Hatyai, Hat Yai Municipal Park, Phra Maha Chedi Tripob Trimongkol, Asean Trade Bazaar, and Kim Yong Market.

2. Explore the citys parks: Hat Yai Municipal Park is a beautiful park that stretches across 200 acres on a hilltop, offering breathtaking views of the city and surrounding mountains. It is home to an abundance of lush greenery and beautiful botanical gardens, and visitors can enjoy activities such as paddle boating, cycling, or hiking up trails that lead to scenic viewpoints. The park also features a 20-meter-tall Standing Buddha statue that has become a landmark of Hat Yai.

3. Visit the temples: Hat Yai has several temples that are worth visiting, such as Wat Hat Yai Nai, which is known for its 36-meter-long reclining Buddha statue, and Guan Yin Temple.

4. Shop at the markets: Hat Yai has several markets that offer a variety of goods, such as Kim Yong Market, Khlong Hae Floating Market, and Greenway Night Market.

5. Try the local food: Hat Yai has a diverse food scene, with cuisines ranging from Mexican to Malaysian. Visitors can try street food at popular outlets like Chokdee Dim Sum or dine at Western-style cafes like Foresto Cafe.

6. Visit Songkhla Central Mosque: This iconic mosque is a must-visit attraction in Hat Yai. Visitors can admire the beautiful architecture and learn about the history of the mosque.

7. Explore Ton Nga Chang Wildlife Sanctuary: This wildlife sanctuary is home to a variety of animals, including elephants, tigers, and gibbons. Visitors can go on a jungle trekking or waterfall tour to explore the sanctuary.

8. Visit Songkhla Old Town: This charming old town is filled with street art, cafes, and old heritage buildings. Visitors can take photos, admire the architecture, and visit the Chinese colonial-style building that houses a collection of Chinese furniture.

9. Experience the interactive arts at the 3D Museum: This museum features interactive 3D art that visitors can pose with for photos. It is a fun and unique experience for all ages.

10. Enjoy the nightlife: Hat Yai comes alive at night, with markets like the Greenway Night Market and the Asean Night Bazaar. Visitors can also enjoy lively parties and events during the annual Songkran festival.

These are just some of the things to do in Hat Yai. Visitors can also explore waterfalls, mountain retreats, and other hidden gems in the city.