This scavenger hunt develops the students' use of selecting an appropriate unit of measure and attribute. In order to correctly fill out the worksheet, students need to read the sentences carefully to be able to correctly measure.
Have set up befor going on a nature walk! - I love math that is so visual. This link will open to an article on Kindergarten Math but so many of the activities can be adapted to younger students, like the leaf activity pictured here.
Provide different nonstandard units of measurement for students to experiment with. Leave the measuring open-ended so that students can freely measure any object they feel are appropriate using the tool.