Hey... In Munich first thing I would recommend is to rent a bike, it's the best way to visit the city, you'll see much more riding a bike... All the city centre is pretty nice, If the weather is good you have to go to the English Garden (and visit one of the many Beer Gardens over there), Olympia Park, and Nymphenburg palace are also nice spots, in sunny days everyone goes to the river either to ''swim'' or to do a barbecues (rather in the southern part) the atmosphere is great over there... To go out at night the best area is the Glockenbach neighborhood with plenty of diverse bars and nice restaurants. Around the city centre (in the street ''Im Tal'') there's also a lot of bars and restaurants also some nice but much more touristy area... I’m so much better giving advices about Lisbon than Munich, but check this 2 great websites with plenty of info… (www.munchen.de and www.toytowngermany.com) and feel free to ask anything else...
Have Fun