Best countryside places out of Berlin

I am just wondering, since it is summer, I would love to visit some countryside. Preferably around 1 to 3 hours out of Berlin. I just need to get out from the hectic metropolis area. Any suggestion? I do not want to go to another town or city. I want to witness what Germany can offer in term of serenity and calmness side of the country.

I dont mind traveling alone as long as those places are accessible via train and some decent backpacker´s place? I dont mind camping too! Probably the Germans know better.

THanks!

It's a little bit on the far side (about 3 hours), but do check out Rügen. It's beautiful.
http://en.wikipedia.org/wiki/R%C3%BCgen

High Fläming Nature Park (German: Naturpark Hoher Fläming) is a 827 km² nature park in Potsdam-Mittelmark district in the German state Brandenburg. It is the third largest of 11 nature parks in the state of Brandenburg ...

Spreewald (http://web1.hamburg015.server4free.de/sixcms/list.php?page=neu), Mecklenburgische Seenplatte (http://www.mecklenburgische-seenplatte.de/Default.aspx?file=seenplatteerleben) and Sächsische Schweiz (http://www.saechsische-schweiz.de/start/click.system?act=lang&lang=en&sid=bCCQ7ozgzWUxhHwl7sMqt9qK2zuBF4GQ) are the landscape-highlights around Berlin.

Schorfheide north of Berlin or all of Meck-Pomm. Just because these happen to be in my inbox at the mo:

http://www.luzin.de/ausstattung.html#

How about National Park Saxon Switzerland? It's less than an hour further south(east) of Dresden.
You could probably take Berlin - Prague train and just get off the train at the border station Schöna. It shouldn't take any more than three hours to get there from Berlin.
In Saxon Switzerland you could camp or stay in a hostel such as Ferdinands Homestay (unfortunately the site is only in German), go hiking, climbing, canoeing and so on.

Edit: Sorry, didn't read TobyG.'s post properly before I posted.

I totally agree.. we just got back from a vacation there.. It was beautiful, and very relaxing.. A great place for hiking and enjoying the scenery.. I recommend seeing the bastei, and the festungs konigstein..

heres some photos-

http://i161.photobucket.com/albums/t209/sw...in/DSC00517.jpg

http://i161.photobucket.com/albums/t209/sw...in/DSC00539.jpg

I'm planning a little trip with my son to Rövershagen just outside of Rostock where there is a strawberry farm & you can pick your own strawberries. Also a butterfly garden, ceramic wekstadt and other things for children & adults.
Karl's Erlebnis Dorf
www.bauernmarkt.de/html/45/index.html

the cafe at the bottom has great ice cream