“The Little Mermaid” from the fairytale with the same name, by HC Andersen, is probably the best known tourist attraction in Copenhagen.
Here are a few things that I bet you didn’t know:

1961 - September 1
Bra & panties were painted on her, and her hair was ‘dyed’ red
1963 - April 28
She was covered in red paint
1964 - April 24
She was decapitated
1976 - July 15
She was covered in paint
1984 - July 22
Her right arm was cut off
1990 - August 5
Another attempt to decapitate her was made
1998 - January 6
She was decapitated
2003 - September 11
She was removed from her stone and pushed into the water
… but she’s a tough lady - she has survived!
mikaelhellstrom Attraction Review, Travel copenhagen, The Little Mermaid

Why is Copenhagen so wonderful? Here what I think of when I think about Copenhagen:
Home to HC Andersen (Poet and Fairytale Writer)
- The Little Mermaid
- Carlsberg Beer (”Probably the best beer in the World”)
- Tivoli Gardens (Amusement Park)
- Fashion Week (Top 10 fashion events in the World held twice a year)
- Design (contemporary Scandinavian design)
- Freetown Christiania (self-governing area of the city of about 850 hippies)
these are a few of the things that best describe Copenhagen to me.
mikaelhellstrom Destinations, Travel copenhagen

Built on 14 islands around one of Europe’s largest and best-preserved medieval city centuries, the Swedish capital is superbly positioned, with stunning and extremely varied scenery in every direction. Stockholm offers a several museums, theaters, sights, attractions and events, whether you’re interested in history, art, opera, modern dance, traditional handicraft, contemporary design or anything else. Stockholm is a very diverse city with something for everyone.

You can stroll around in “Old Town” with buildings from the 1300’s.
Or admire the contemporary architecture.
The talk of the town right now is the grand opening of “ABBA - The Museum” which opens in June 2009 but tickets are already on sale! 6,500 square meters (70,000 square foot) on four levels, featuring everything about on the the biggest Swedish icons - ABBA. http://www.abbamuseum.com/index.php?lang=1
The spring and summer (April-September) are definitely the best times to visit Stockholm. I hope the temperatures below will give you some indication of what works best for you.
Temperatures
Winter: from +2 to - 7C (36 to 19F)
Spring: between +5 and 15C (41 to 59F)
Summer: 20-25C (68 to 77F) or warmer
Autumn: between +5 and 18C (41 to 64F)
Best regards,
Mikael Hellstrom
Product Manager - Scandinavia
mikaelhellstrom Travel, Travel Guide ABBA the Museum, Scandinavia, Stockholm