Rhada D.
Yelp
There are 3 parts to Hellbrunn: Trick fountains, Hellbrunn itself, and the park.
The trick fountains are fun to look at, but it seems to be more for children. Beware--keep your electronics safe. The tour guides turn on the fountains without warning! Furthermore, the tour groups are far too large to really enjoy this part. You can see most of the fountains from the "free" parts of Hellbrunn as well. Also, if you don't want to get wet, pay attention to the areas where the ground is wet and don't stand there...
Hellbrunn palace is quite lackluster inside. Don't expect much. You can go through it in about 10 minutes. There are a few interesting bits (painted ceilings, etc.), but you aren't really missing much if you skip it.
The park is what makes the trip to Hellbrunn worthwhile. They are amazing, beautiful, large, etc.