Heron Rookery and Pinhook Bog are two sections of the Indiana Dunes National Lakeshore separated from the rest of the park and are quite far away.
The Heron Rookery is a one-way trail along a river where blue heron used to nest. It’s not that great, especially considering the fact that no more heron exist there.
The other section, quite possibly the most interesting part of the entire park, is Pinhook Bog. Accessible only through ranger-guided hikes on certain Saturdays throughout the year, it’s an acidic bog with sphagnum moss and carnivorous plants formed by a piece of glacier that broke off 15,000 years ago. As a relatively young bog, it’s nothing like bogs found in Europe that can be cultivated. It’s a short 0.3 mile hike to the boardwalk over the bog. A separate, 2 mile hike takes you through the forest and along the bog, but doing the actual bog trail is enough. Ask at the visitor center for directions to the parking lot because it can be difficult to find.
Every couple weeks, different flowering plants can be found blossoming at Pinhook Bog, making it a very special place for flower lovers. There are also a few species of carnivorous plants to be found.