In this fun summer themed STEM challenge, students are challenged to use provided materials to design and build a model of a sandcastle for an upcoming sandcastle contest. This task will challenge students to use their critical thinking skills to measure and calculate perimeter and area. Additionally, students must use their knowledge of solid plane figures to meet the restraints of the challenge and incorporate 3-D figures into their design. The challenge comes complete with student worksheets for every step of the design process, as well as math, language arts, and engineering extension activity suggestions. I hope this activity is a fun and engaging end of year activity for you and your students!