This is a list of useful places near the CCH (or easy to reach by train/bus (see public transport)). It is not representative or complete.
If you need something and can't find it here ask an Angel or the Info desk, they'll be glad to help.
Also: please add and update this list!
Pharmacies and Healthcare
Pharmacies are closed during the night and on Sundays. There is an emergency service of pharmacies on an alternating schedule. Please contact CERT, they can find an open pharmacy for you.
Public Swimming pools
Car rental and taxi
For more information on the local public transport (HVV) see Local transport
Tickets for the local public transport (HVV) are sold on ticket machines on every station or inside the bus. There are also some counters nearby.
Spätis are small convenience stores which are open long after everything else has closed for the night offering some essentials things (beer, chocolate and maybe Mate).
Right next to the hustle and bustle of 30C3, the public tropical greenhouses (Tropengewächshäuser) are a warm and usually quiet place to escape crowds and noise. Admission is free. Open 10:00–15:45 on Sat/Sun/holidays and 09:00–15:45 on workdays. There are toilets for visitors, I think. There are no benches or chairs to sit down. — OSM: http://openstreetmap.de/karte.html?zoom=18&lat=53.56&lon=9.985 — How to get there from inside CCH: Go to the first floor. Use the southern exit towards "Planten un Blomen" park – if you face nearby Dammtor train station, the park is to your right. The tropical greenhouses are a few metres south of CCH and have only one open entrance. When in the lobby, you are for some reason not supposed to use the door to your left to start your tour; instead, you should walk up the ramp past aquariums to enter the first and largest of the five greenhouses. Each room leads to the next until you are back at the lobby.
In the Grindel Area (see Food) are many shopping opportunities. Shops are open Monday to Saturday 7am to 8pm (some up to 10pm).
In the Mönckebergstrasse (starting from Hauptbahnhof) are all kinds of shopping centers and stores - from clothing to Lego Mega Store.
for a more useful address look here: http://www.gaestehaus-uni-hamburg.de/index.php/en/information-a-to-z