It is appropriate as written for 5-6 grades also. The Quest can easily be adjusted for use at different levels. Here are some suggestions of ways that you can modify it to meet your particular students capabilities. One task that students are required to perform is to create a budget for their trip. The Quest provides students with a form for accomplishing this task.
Beginners can just print out the sheet and fill it out by hand.
For students needing more of a challenge the spreadsheet can be used digitally. They will need to create a formula that will deal with the numbers that they enter. A graph can also be required as an additional task. Students are asked to estimate the costs that they will incur. The Quest as it is provides a structure for them by suggesting that they need to find costs for travel, food, entertainment, lodging, and equipment.