Population around 40.000, so it not like you're getting lost or anything...
There is an interesting church in the center of town called the Trefoldighetskirken. It is easy to find in the heart of the city. It is probably also one of the few churches in the world with a 7-Eleven in its basement.
The Hove Festival is one of Norway's biggest music festivals featuring big international acts in every music genre. It is located at an island called Tromoya, just outside the city centre. The festival mixes large international acts with Norwegian bands in the unique setting of an island outside Arendal city.Besides the music, you'll share experiences from the quirkiest art scenes, watching yet-to-be-released movies and eating delicious ecological food. There is no age limit to the festival and children under 12 are admitted free.
In 2010 the British newspaper The Daily Telegraph pointed out Hove Festival as the best festival in Europe.
Since it's startup in 2007 the Hove Festival have had big internation acts like The Killers, Jay-Z, Queens of the Stone Age, The Prodigy, Faith No More, Arcade Fire, Slayer, Slipknot, Vampire Weekend and a lot more. The line-up in 2010 includes Muse, Them Crooked Vultures, Massive Attack, Arcade Fire, Paramore, Empire of the Sun and Florence + The Machine among many more.
The festival is easy to reach from Arendal. There will be buses and ferrys every 15 minutes from the city centre.