And since your kids are in High School maybe talk about college life in America as a lot of your students may be planning on going to college in the states.
Just FYI, the OP said her students are in 5th and 6th grades. I think she just meant that three of those students have a high English level, i.e. equivalent to high school level.
What about making a board game with students?There is a thread on waygook with all the materials to make Settlers of Catan with your students. I'm sure they would love it, learn a lot of new vocabulary, and it would take a lot of pressure off you for lesson planning. This would require multiple, multiple classes to complete. It's a big project.Another option is having students make their own Monopoly board game. You can find blank Monopoly board templates, and have them pick their own theme (examples from my class: Doraemon, Space, Precious Stones, Adventure Time - this was with 3rd and 4th graders). They should get really into it.Hope that helps.