Since you are a student, let me recommend free places:

There is Lotus Hill/Beacon Hill Park in Futian District. There is also the Garden Expo near OCT, and you can take Binhai Avenue. You can also go to the Mangrove Park. These are free parks. It’s not bad for a group of students to bring pokers/kites and some food.

As for free places further away, you can go hiking on Wutong Mountain , bring a meal of dry food for lunch, which can both exercise and relax. The train station has a bus directly to Shawan Dawang Village, which is very convenient. There are two regular routes up Wutong Mountain, Taishan Stream and Panshan Highway. Taishan Stream is a stone step The road goes up along the mountain stream. The scenery is better than the Winding Mountain Highway. If you want to go to Fairy Lake but don't want to buy tickets, you can go to Dawang Village Station and follow the Wutong Mountain Winding Road to Xiaowutong and then go down toward Liantang. There is a road in the middle to go down to Fairy Lake. Lake, there is no need to buy tickets for this road.

If you want to go further, you can also take a bus to Nan'ao. In Nan'ao Town, transfer to a minibus to Xichong. There is the largest beach in the east of Shenzhen, where you can have a barbecue while watching the sea. , if you still feel that it is not enough, then hike from Xichong to Dongchong. These routes are pure coastline hikes, and the scenery is very good for those who have not walked along the coastline. However, some people may be charged at the beach now, but there are also Not much, maybe five or ten yuan per person.