Hiya
münchen.de (so the City Council)'s guide to BBQ.Public areas where BBQs are allowed have signs up to indicate this but you can get a downloadable leaflet from the link above.
Here are some parts of the info summarised in English:
You may only grill with charcoal or gas in a usual grill. Nothing else. One-way grills are fine (the Wal-Mart ones with the flip-out legs are excellent I find).
You are not allowed to build a fire that has direct ground contact due to safety and enviromental reasons.
No tables, beer banks, proper chairs, pavillions or pagodas are allowed - it is a natural area, not yer living room. A small removable sunshade is probably OK, a big beer garden brolly isn't.
You must keep about 10m distance away from trees and dried-out grass (fire risk), take all your rubbish with you when you leave (or place it in the bin provided - yes you should also divide your rubbish - this is for safety and enviromental reasons) and keep the noise down as there are people living nearby.
Around the
Isar you are permitted to BBQ on the pebble banks south of the Brudermühlbrücke (Mittlerer Ring South). The "Grillzone" starts 100 meters south of the Brudermühlbrücke, running down towards the city limits, so until about 500 meters before Großhesseloher Brücke. To the North of the Oberföhringer Wehrs near St. Emmeram you can grill as well.
BBQs are
not allowed in the following areas:
In the central areas from Brudermühlbrücke to Oberföhringer Wehr, so that includes the Braunauer Eisenbahnbrücke, Wittelsbacher Brücke, Reichenbachbrücke, Museumsinsel and Praterinsel.
Grill in those areas and you should expect a fine.
Katrina