Things to do in Canberra at night 
Planetarium and Observatory
  What is it:
The community group 
POAC are trying to get the Planetarium & Observatory moved from Downer to Mt Stromlo, as the previous owner no longer want to operate it. The planetarium is a star theatre and the observatory has two telescopes which you can use to explore the heavens.
Location
Soon to be at the top of Mt Stromlo.
When
Hopefully by 2010
Cost
Only $2.6M
  
Mt Ainslie Lookout
What is it
Located to the East of Civic, this lookout gives a very ipressive view of most of the city. There is ample parking as well maps to help you locate landmarks around the region.
Location
When
Anytime
Cost
Free
  
Telstra Tower Lookout
What is it
Located to the West of Civic, this very prominent tower rises 195m above the sumit of Black Mountain. From the observation level above the restaurant, you get a very ipressive view of the whole city. There is ample parking as well maps to help you locate landmarks around the region. It can be cold and windy in the outdoor section, but there is also lots of room to observer the view from inside.
Location
On Black Mountain, at the end of Black Mountain Drive, behind the National Botanic Gardens. See 
Google Maps ReferenceWhen
9 am to 10 pm seven days a week
Cost
Adults $6.00, children $1.90
  
Questacon by Night
What is it
Questacon, the National Science and Technology Centre, has lots of educational science based activities for kids.
Location
In the parliamentary Triangle between the National Library and the High Court, on King Edward Terrace.
When
 Bookings are essential. Please contact 
Questacon directly for information.
Cost
Around $17.00 per student 
  
CSIRO Discovery Centre
What is it
CSIRO's interactive science education centre
Location
When
Cost
Around $6.00 per student 
  
Twilight Forest Adventure
What is it
 A guided activity that explores the Australian National Botanic Gardens by night. Torches, water resistant ponchos and hot chocolate drink provided. Find out more from the 
Botanic Gardens Website.
Location
When
 Booking essential and minimum and maximum group sizes apply.
Cost
 Around $8.00 per person 
  
Floriade Nightfest
What is it
 Part of 
Floriade, the annual spring flower festival.
Location
 Commonweath Park
When
Cost
 Around $16.00 per person 
  
Reconciliation Place
What is it
 A recognition of indigenous culture.
Location
 On the shores of Lake Burley Griffin in front of the National Library and stretching towards the High Court. See 
Wikipedia article.
When
 Anytime
Cost
 Free 
  
Commonwealth Place
What is it
 A monument to the diplomatic mission in Canberra with a flag flying for each one. 
  See 
Wikipedia article.
Location
On the shores of Lake Burley Griffin between Questacon and the High Court.
When
 Anytime
Cost
 Free