There are many outdoor activities that you can do in Singapore. Here are some recommendations:

1. Hiking: There are many hiking trails in Singapore, such as Bukit Timah Nature Reserve, MacRitchie Reservoir, and Pulau Ubin.

2. Cycling: There are many cycling paths in Singapore, such as the East Coast Park, the Punggol Waterway, and the Marina Bay area.

3. Water sports: Singapore has many water sports activities, such as kayaking, stand-up paddleboarding, and wakeboarding. You can find these activities at places like Sentosa Island, East Coast Park, and Kallang Basin.

4. Outdoor sports: You can also find many outdoor sports activities in Singapore, such as rock climbing, frisbee, and soccer. You can check out places like the Singapore Sports Hub and The Cage Sports Park.

5. Nature walks: You can take a nature walk at places like the Botanic Gardens, Gardens by the Bay, and the Southern Ridges.

6. Beach activities: You can have fun in the sun and sand at beaches like Sentosa, East Coast Park, and Changi Beach.

7. Picnics: You can have a picnic with family or friends at parks like the Botanic Gardens, East Coast Park, and Fort Canning Park.

8. Outdoor events: Keep an eye out for outdoor events like concerts, food festivals, and night markets that take place throughout the year at different locations around Singapore.

Remember to stay hydrated, wear sunscreen, and take precautions against the heat and humidity while engaging in outdoor activities in Singapore.