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Poland
Hitchhiking in Poland

This guy offers a few interesting thoughts; apparently he successfully hitchhiked in Poland.  Nomadic Simes

brief (positive) mention of hitchhiking in Poland  

For short trips on roads without much public transport it's probably the best way.  It's very common.

Hiking

If you want go hiking in Eastern Europe, the High Tatra mountains on the Polish/Slovak border are the place to go. At least if you're going between mid-June and October, the most exciting trails are closed the rest of the year. If you haven't decided when to go yet, September is the best month, since in June there is still a lot of snow, July and August are most crowded, and in October the weather can get pretty bad already.

Guide to hiking the High Tatra mountains

If you're a poor college student Slovakia's ideal, if you add up all the things you spend money on as a tourist (accommodation, transport, food & drinks, museum/sight entrance fees), it comes out as the cheapest country in Europe.   5000-6000 crowns (170-200 US$) is a comfortable budget for a week there. Poland is somewhat more expensive, but it's still cheaper than western Europe.

Other good hiking areas nearby include the Karkonosze on the Polish/Czech border and the Slovensky Raj in Slovakia. They're "open" all year, but also less challenging.  

In the Karkanosze mountains it's helpful to speak Polish or Czech.  There are plenty of resources on location. The people there will tell you what the best trails are. June is a beautiful time to go there, it will be very busy with tourists (make reservations if you plan to stay at the "schroniska" (lodges) but the scenery is unforgettable. There is an interactive map on this site: http://www.gory.ibc.pl/karkon.php

Don't be afraid to search the web in Polish if you're looking for maps. Give this one a try. karkonosze.it.pl.  There is information about prices for lodge stays and it is actually spelled Karkonosze...

Other interactive maps include http://gss.abis.lodz.pl/~ftomek/karko/spis2.html which also includes times.

Even if you don't speak Polish, you can look at the pictures.

I bought a good map that included times in Jelenia Gora beforehand. It had both the Polish and the Czech side on it.

The walks aren't extremely challenging, you do get to see a lot of fine scenery, odd rock formations and a couple of waterfalls. I would really recommend the area for anyone who wants to include some nature in their European travels.

Places to Stay
    
There is a lovely little pension in Szklarska Poreba. It's called Pensjonat Lider and it actually has a website. It's 50 zloty (about 11 € )  for a single room with brand new bathroom (the sink even had a plug!), balcony, TV, fridge, kettle and microwave. It's also an internet cafe and they have unlimited free internet access for guests. It's another 10 zloty for breakfast. One of the best deals I ever came across on my travels, and quite accidently too.

Campsites

For a list of campsites in Poland, see http://www.infolinia.pl/campingidb/default.asp
Wroclaw, Poland - Camping N° 267 Sleza

Not a particularly nice campsite, but it's a short walk to the centre. No English spoken, and only a little bit of German.

Poznan, Poland - Camping N° 155 Malta
Large campsite near lake Malta. It's about 1/2 hour walk to the Rynek, and 15 minutes (along the lake) to the nearest tram stop. Walking trails nearby. Very good English spoken at the reception.

Znin, Poland - PTTK Camping
Small, basic site on the shore of a lake (beautiful sunsets!). Some German spoken, no English, but they're very friendly anyway. Probably the only place to stay in the village, which makes an excellent base for a daytrip to Biskupin, recommended for archaeology- and (pre)history-lovers. Nature in the area is very nice as well.

Gdansk, Poland - Camping N°10
A short walk to the beach, not too far from the centre by tram. The neighbourhood it's located in is nice to walk around as well. Many different nationalities staying here, especially popular with Scandinavians. German spoken. There's a bar.
Wroclaw, Poland - Olimpijski (N° 117)
Further from the centre (but easy to reach by tram) than the Sleza site, but also a lot nicer. Across the street from Park Szczytnicki, a very large and pleasant park where you can easily spend an entire day

Jelenia Gora, Poland - Park (N°130)
Just outside the old town, about a 10 minute walk from the Rynek. Most of the terrain is occupied by cabins, but there's a field for tents too. Has a kitchen.
Klodzko, Poland - Camping Amfiteatr (N° 132)
Also just outside the old town. Small site, nothing special but OK.
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