River Boat Taxis

Chao Praya Express Boat (เจ้าเรือด่วนเจ้าพระยา)
Phone: 02.445.8888
Hours of Operation: 06:00 - 20:00 (19:00 on weekends)
Fare prices: 10 - 32 baht, according to distance traveling.
Below are the various routes of the Chao Praya Express

Klong Saen Saep (Saen Saep Canal / เรือโดยสารคลองแสนแสบ)  
See video at the top right or here
Hours of Operation: 05:30 - 20:30 (19:00 on weekends)
Fare prices: 8 - 20 baht, according to distance traveling.
Below are the routes and maps of the Golden Mount and Nida lines. 

The service runs between the Pom Prap Sattru Phai and Bangkapi districts in Bangkok. Pratunam pier serves as an interchange between the western line, Golden Mount, and the eastern line, NIDA. All passengers are required to depart so you should have no trouble determining the location of the interchange. 

NIDA Route

1. Pratunam - interchange, near the Pratunam garment district, Central World, and Panthip Plaza.
2. Chidlom - near Central Chidlom.
3. Wireless - at Witthayu Road near British Embassy.
4. Nana Nua (Sukhumvit Soi 3) - near Bumrungrad Hospital, "Little Africa" neighborhood.
5. Nana Chard (Sukhumvit Soi 15)
6. Asoke-Petchaburi - near Bangkok Metro Phetchaburi station and the old site of the Embassy of Japan.
7. Prasanmit - at Srinakharinwirot University (Prasarn Mitr Campus).
8. Italthai - at Italthai Tower
9. Wat Mai Chonglom - near Royal City Avenue (RCA).
10. Baan Don Mosque
11. Soi Thonglor - a trendy street with many boutique shopping malls.
12. Charn Issara - at Charn Issara 2 Building.
13. Vijit School
14. Sapan Klongtun - near busy intersection of Petchaburi, Ramkhamhaeng, Rama IX and Phra Khanong roads, with Bangkok Skytrain (BTS) shuttle-bus service.
15. The Mall Ram 3 - The Mall Ramkhamhaeng, near Rama IX Road intersection.
16. Wat Noi
17. Ramkhamhaeng 29
18. Wat Thepleela - Soi Ramkhamhaeng 39
19. Ramkhamhaeng University - Opposite Ramkhamhaeng University.
20. Mahadthai
21. Wat Klang
22. The Mall Bangkapi - The Mall Bangkapi on Lad Phrao Road.
23. Bangkapi - Bang Kapi district office and market.
24. Wat Sriboonreung - terminal pier, near National Institute of Development Administration (NIDA)

Golden Mount Route

1. Panfa Leelard - terminal, near Golden Mount and other attractions.
2. Talad Bobay - a large garment market.
3. Sapan Charoenpon
4. Baan Krua Nua
5. Sapan Hua Chang - near MBK Center and Bangkok Skytrain National Stadium station and Siam station, and closest to Bangkok Skytrain Ratchathewi station.
6. Pratunam - interchange, near Pratunam garment district, Central World and Pantip Plaza.

Map of Nida and Golden Mount Routes

Map of Nida Route