You will probably land in Stockholm (Arlanda Airport) which is a beautiful city for the photographically inclined.
( http://www.geographia.com/sweden/stockholm.html )
August is very nice btw. Östersund ( http://www.turist.ostersund.se/ ) is inland and about 650 km (NNW) from Stockholm, 8-10 hours non-stop drive. Not recommended for the tourist. (driving non-stop in the moose hunting season) Make it two days and enjoy the scenery.
South and south-west of Stockholm there is a metric a**-ton of cool sights. Old cloisters,
( http://www.raa.se/sites/alvastra.asp )
ruins, channels, locks, and waterways.
( http://www.gotakanal.se/en/ )
And nature. We have available nature it in spades.
( http://www.environ.se/allemansratten/ )
And the Stockholm Archipelagio.
If you swing by Uppsala (90 km NW of Stockholm) I will be happy to show you around. We have a Viking museum,
( http://www.raa.se/olduppsala/index.asp )
a 12 c. cathedral,
( http://www.factbites.com/topics/Uppsala-Cathedral )
one of the few anatomical theatres still excisting,
( http://www.gustavianum.uu.se/english.shtml )
and a university founded in 1477.
( http://info.uu.se/fakta.nsf/sidor/about.uu.idE1.html )
(edit) Kodak, Ilford, and Fuji films are readily available in most cities. 120 films can be a little bit tricky, so my recommendation it to stack up while in Stockholm.