The class felt a lot like an introductory physics class with a lot of formulas thrown at you which you then have to use to solve various problems. Although 221 is a prerequisite, when I took it the professor took a few days reviewing all the necessary background and the most complicated thing we had to do with linear algebra was compute the eigenvalues of a 2x2 matrix.
Differential Geometry is a classic choice for the math major elective. It's like any regular math class - no projects just exams and homework. Grading is traditionally not bad and luckily the class starts from the foundation so it's doable. Don't get me wrong it's a lot of work but most classes take time and are hard.