1

The National Museum ( do not miss this! ), Wat Phnom, Koh Dach (aka Silk Island), Tuol SLeng ("Genocide Museum")...

2

The National Museum is nice if you're into artefacts. Otherwise, give it a miss. It's nice to walk around the grounds Phnom Penh School of Fine Arts on St. 178, but that doesn't take long...

Tuol Sleng is sobering but worth the visit.

If you're an early bird, go to Olympic Stadium for sunrise. Trust me, you won't regret it. If you're more of a night owl, the park running north along Sothearos from Sihanouk is an entertaining stroll in the evening.

Take a bicycle (or moto) on the ferry from the foot of Sihanouk (near Dreamland) across to the other side of the river. It's amazing how close rural Cambodia is to the big city.

Get lost in O'Russey Market.

If there happens to be a Khmer Architecture Tour on the day you're there, don't miss it. The guides are knowledgeable and passionate about their city.

Check out the Lady Penh website (or others) for any special events going on.

3

Many thanks. Lots to think about x

4

I'll second almost everything said in the second post and also add that I found it amazing to just sit and watch the rush-hour moped/tuk-tuk madness as the sun went down.

I would however not drive in the city - madness unless you are used to it. Amazing to watch though.

5

Tuol Sleng / S21, the former school turned prison turned museum of the Genocide should not be missed. It's a disturbing visit but it's worth the trip to Cambodia.

I really enjoyed the little boutique cafes, art galleries and hotels that you can find on Road 240. it clearly targets Western expatriates but it's lovely. I'd also recommend having lunch and dinner at the excellent, trendy Friends' tapas bar and restaurant run by street kids on Soi 13, and at the legendary Foreign Correspondent Club on the river.

http://travelhappy.info/cambodia/phnom-penh-cambodia-the-ghost-city-come-back-to-life/