Jeep Offers

I’m currently half way through Year 10 at school. In the summer holidays after I have finished Year 11 we have a 4 week school trip to Kenya. It will compromise of volunteer work, wildlife conservation, a safari and scuba-diving. This is a once ina lifetime opportunity and will look great on my CV however, in total the trip cost £3450 and is to be made in three payments of £1150. I have several ideas including:

-Selling sweets, chocolate and pop at school
-Car boots
-Washing peoples cars
-Raffles

I feel this is a great start however I need some more ideas, thanks in advance.

We have auctioned cars, sold plants, held dinners, raffles etc, but need something new that will interest the general public. Any suggestions would be most apreciatted, thank you.