We went to the park at the weekend and came back late in the afternoon, some friend suggested to have dinner together at Days Inn Luohu near the Luohu Railway station. The foods there is great in my opinion, although you may not find as many food as another buffet at Kingglory Plaza area, but for a buffet cost a bit more than 60 RMB, it is worthwhile. It remembers me my visit to Changping in Dongguan, at some star hotel, everything seems similar to me, decoration, food, price.
By the way, the Days Hotel Luohu has more than 200 guest rooms as stated, and you can book a room through their toll free reservation line in China, it is 8008100090. They provide airport pickup service as well. Their address is: South Yanhu Road, Twins Century Building, Luohu, Shenzhen. An easy to get there would be you get to the Luohu metro stop and take the E2 exit, you can see big advertisment board at the metro/subway exit, from the E2 exit to Days Hotel Luohu, it takes about 6 minutes by foot.