Most of Vientiane's sights are spread around the town. I will probably hire a bicycle as this has been recommended as the best way to get around. Rental costs about 4000+kip/day.
A few things to look at could be:
Wat Pha Kaew: (Temple of the Emerald Buddha) Setthathirat Rd. E of President Palace, in front of Wat Sisaket. Entry fee: 1,000kip 8:00-12 & 13:00-16
Wat Sisaket: Lane Xang Rd + Setthathirat Rd. opp. from Wat Pha Kaew, Wat is free but the museum 1,000kip 8:00-12 & 13-16:00 The oldest original temple in Vientiane, built by King Anou in 1818. Houses more than 2,000 small Buddha statues, brought here by devotees.
Anousavari Monument: The triumphal arch of Vientiane built in 1962. NE of Lane Xang Rd. Monument for the people who died in wars defending the country. It is possible to climb up the Monument 1,000kip 8:00-17:00
That Luang: The holiest Stupa in Laos, 3km NE from center of the town along Lane Xang Rd. Built by King Settathirat in 1566. Very unique-shaped Stupa and the most important religious symbol of the country. 2,000kip 8-12, 13-16:00
Lao National Museum: Samusenthai Rd. W from Lao Plaza Hotel 3000k 8-12, 13-16:00 A lot of propaganda.