I am not an environmental engineer, but I work with many in my line of work. Here is what I can tell you:
Environmental engineering, and environmental regulation in general, has more to do with managing the human impact on the environment for human health rather than conservation for all the plants and animals. You deal with issues like water quality, waste water treatment and sewage systems, air pollution abatement, landfill design, and other waste management systems. You might do environmental site impacts, like evaluating the level of contamination at a brownfield. I'm sure you already found that online.
Day-to-day? The guys in my work place will review permits to determine if they are in compliance, review reporting information, do inspections in the field, evaluate the condition of a waste water treatment facility, verify that a new facility is in compliance, do field assessments if a highway is plowing over a wetland. Most guys spend all day in the cube. The inspectors will spend lots of time in the field, but I imagine that work will get tedious because they are checking for the same thing everyday and then filling out the same forms at the office.
I work in government regulation, which seems less dynamic and interesting than the work that might go on at consulting firms and universities, but government work has considerably less pressure and is more stable. I really cannot speak for the day-to-day in private consulting or a university, but I hope it's more interesting than state government regulation. Just try not to get stuck in the cube, unless you don't mind that environment.
Plus, these engineers don't have much a sense of humor.