Hello My Co and I are looking to have a environment themed Summer camp (HighSchool).

It will be a week long 2 hrs a day with above average language ability

i am looking for some ideas of what we can do. 
We really want to put emphasis on speaking everyday.
The main focus idea that we have come up with is that the students will create a poster that compares/contrasts between Korea and other countries.  On the last day the students will give a presentation of their findings.

I will likely give a presentation on the environment (highlighting Global warming)  Keeping it to 15-20 min on the first day

perhaps an open discussion after but with 20 or so students it will be difficult to monitor.

We also discussed some kind of field trip.  The only thing I can think of is garbage collection but that sounds like more of a punishment than a learning experience


Any ideas what else we can do? 

As well as focusing on Global Warming, you could have a secondary focus on water quality or the importance of water, showing contrasting images from the around the world (Countries experiencing drought-like conditions vs. countries experiencing flooding quite regularly).

Take the students to the nearest river and get each group of say 2 student to make a water filter using some everyday items like an empty water bottle, some cotton wool, pebbles and sand. There are plenty of resources available on the net to aid you in this project.
If you ask the science the science department in your school, you be able to get your hands on allum, a clarifying agent that will make the murky water look incredibly clean and healthy. IT ISN'T!!! DO NOT LET THE KIDS DRINK THE WATER!!!!

Just an idea. I was in the field of environmental education back home and this was always a winner with students, especially coming from Africa.

Here's the link to some materials the EPA has set up for ESL adult learners..but they also have it put into 3 different levels. I havn't looked yet but maybe it can help you.

http://www.epa.gov/osw/education/pdfs/tesol.pdf

Also http://www.stopwaste.org/home/index.asp?page=1078 <--has some detailed lesson plans..I think about 15 for younger learners.

https://www.youtube.com/movie/home-english-with-subtitles

I don't have any speaking activity ideas... sorry.

This is an absolutely stunningly beautiful video that looks at our beautiful planet and some of the great environmental threats.

Also when my classes made environmental posters they had to search for recycled materials to make them with. There were some fantastic results.