This is an activity sheet that I use with the Jamestown Online Adventure that has students record their decisions and reasoning as they try to start their own colony. I think something like this is very important if you want to move from the website being a fun activity to it being something that you can discuss and even assess. Also included is a Top Hat organizer for comparing the colony students create to the actual Jamestown colony.
This is a very successful activity in my 5th grade classroom that I hope your students will enjoy as well. (I use it at 5th grade, but feel that it could work for any group learning about Jamestown and the early English colonies.)