When going to Huadian, there must be a bus barbecue. This is really what Huadian must do. I don't know where you come from, but I suggest you ask your friends and relatives to take you out to eat some special food. Northeast cuisine, Korean restaurant and barbecue are highly recommended.
Anyway, the tourist attractions in Huadian are generally natural landscapes, including Xumigou Snow Valley, Zhaojiji Mountain Scenic Area and Hongshi Lake. Maybe I have personal feelings, but I still think that only Jilin has beautiful mountains and rivers.
However, the scenic spots in Huadian are generally far away from the urban area, and there is no special bus, so you can only choose to charter or drive by car. There is a rafting in Jinsha Canyon, which seems to be self-driving, but it is also fun when there are many people. There are also travel agencies in Huadian that send delegations to Changbai Mountain.