Putting out a Fire from the opposing faction may flag you for PvP! You will also be rewarded with 10 Burning Blossoms for each opposing faction's fire and 5 for your own faction's. Put out the following fires during the Midsummer festival:

Horde

1. Ashenvale: Located just East of Silverwing Refuge cords 52,67
   
2. Desolace: Located South of Shadowprey Village at the beach at cords 26,77
   
3. Durotar: Located just south of Razor Hill at 52,47
4. Dustwallow Marsh:  Located just West of Brackenwall Village at 33, 31
   
5. Feralas: Located West of Camp Mojache at cords 72,48 just follow the road.
6. Mulgore: Located just East of Bloodhoof Village at cords 52,59
   
7. North Barrens: Located north of the Crossroads at cords 50,54
8. Silithus: Located Southwest of Cenarion Hold, on the North side of the road cords 51, 42
9. Southern Barrens: Located at cords 41,67 at Desolation Hold
10. Stonetalon Mountains: Located Southeast of Sun Rock Retreat at cords 53,62
11. Tanaris: Located near the Alliance Flight Master at Gadgetzan 50, 28
12. Winterspring: Located just West of Everlook at 58,47

Alliance

1. Ashenvale: Located in Forest Song at cords 87,42 
2. Azuremyst Isle: You get to Azumyst Isle by taking the west boat from Ruttheran Village in Teldrassil, once you're there look out for high level guards ( 80 - 90 elites ). Once you get off the boat go east following the road to cords 45,53 till you find the flame.. It´s on the west road from Azure Watch.
3. Bloodmyst Isle: Located at cords 56,69 which is south from Blood Watch. You get to Bloodmyst Isle from Azuremyst Isle by going north.. Just follow the road and you will find this.
4. Darkshore: Located just Southwest of Lor'danel at cords 49,22
5. Desolace: Located at Nijel´s Point at cords 66,17
6. Durotar: Located just South of Razor Hill
7. Dustwallow Marsh: Follow the road North from Theramore Isle to 62,40
8. Feralas: Located just North of Feathermoon Stronghold at cords 47,44
9. Silithus: East of Cenarion Hold along the road at cords 60,33
10. Tanaris: Located near the Horde Flight Master in Gadgetzan 53, 30
11. Teldrassil: Found at cords 55,53 and it's possible to fly there at 280% from Darkshore,if you fly from the point between Lor'danel and Shatterspear War Camp you can do it at 50% fatique.
12. Southern Barrens: Located at cords 48,72 just south of Fort Triumph
13. Thousand Needles: Located at the Southwestern section of Freewind Post
14. Winterspring: Located just West of Everlook at 61,47

2011 Azuremyst Isle.

You get to Azumyst Isle by taking the west boat from Ruttheran Village in Teldrassil.
Once your there look out for high lvls guards ( 80 - 90 elites ).
Once off the boat go east followering the road to cords 45,53 till you find the flame.. It´s on the west road from Azure Watch.
Like Bloodmyst Isle Azuremyst Isle is a no fly-zone.
Horde has none here.

2011 Bloodmyst Isle.

Here you find the alliance flame at cords 56,69 which is south from Blood Watch. You get to Bloodmyst Isle from Azuremyst Isle and going north.. Just follow the road and you will find this.
Bloodmyst Isle is a no fly-zone so mount up and run :o)
Horde has none here.