Public Transportation to Following Attractions in Chongqing.

1 &3. You can take metro line 6 from downtown area to Beibei Station, Exit 2A. Walk south for about 350 yards, and turn left. Walk east for about 200 yards to Beibei Bus Station. Afterwards, you can follow these routes to the attractions:

To Northern Hot Spring, take bus line 510, 511, 518, 519, 520, or 556 to the spring directly.
To Jindaoxia, take a bus to Liuyin Town. Then, take a motorbike to Jindaoxia for about CNY10.

2. Take a bus to Wansheng from Chenjiaping Bus Station. The buses are available from 8:00 to 17:30, and the fare is CNY 40. Then, take a bus to Heishan Valley Tourism Area. Or, you can taxi there for CNY 40-50.