May is definitely going to be hot, not sure if it's going to rain though. The night view of Pearl River is amazing, you must see it. Tianhe has some big malls and it's the most flourishing area, great place for both shopping and sightseeing. And China Plaza is young people's fav, there are also two underground malls nearby. And the best Cantonese restaurant must be Bingsheng, there's one located in Tianhe. If you're lucky enough you will see people doing sports and dancing in the squares at night, it's a very interesting culture, too funny my friends and I always stop and watch.