Information regarding parking at Lake Obernberg at the end of the page.
Lake Obernberg is a mountain lake situated at 1590 meters, a 40-minute drive and a further 30-minute hike from Innsbruck. Despite its proximity to Innsbruck, the lake is relatively secluded, and you'll usually encounter only a few other visitors. Swimming is officially prohibited due to the fragile ecosystem, and besides, the water is usually too cold for swimming.
A walk around the lake takes about 60 minutes, depending on the water level (in addition to the 30 minutes from the parking lot to the lake). However, the impressive landscape always invites you to rest, and so you should take half a day off for this excursion.
It is also worth seeing Chapel Unserer Lieben Frau am See, which was built in 1935 on a peninsula in Lake Obernberg. The chapel is not easy to find as it is hidden on the peninsula. When you reach the lake and keep to the left of the shore, after a few hundred meters a small footbridge on the right leads to the peninsula with the chapel.
Info
How to get there: 40 minutes by car from Innsbruck to a large paid car park just after the village Gereit. There is usually enough parking space, even on weekends. Then a 30 minutes walk along a country road or steep path (shortcut).
Services: There is a toilet and a little Restaurant at the parking lot (the restaurant is not always open). At the lake itself there is no toilet, shop or anything else.
External Link: Municipality of Obernberg am Brenner – State of Tyrol