Science, technology, engineering and math (STEM) classes tend to be the hardest because GPAs tend to be lower, according to Kevin Rask, an economics professor at Wake Forest University. His decade-long study observed over 5,000 students at an anonymous college. Plenty of challenges do lie in non-STEM curriculum, but staying away from those courses is a good place to start if you are in search of an easy A.
Most athletic courses don't pose much of an academic challenge, and they are often graded on a pass/fail basis. Tennis, basketball and even bowling are offered at many institutions. While some of these can be physically demanding, the grading is easy ao long as there is a genuine effort on your part. Good attendance is almost always required, however, as the professors are usually aware of the students' reasons for taking the class.
Sometimes, subject matter is incidental as long as the professor is known for being lenient. Word of mouth on campus is one way to ascertain which classes to take, but there are also websites such as RateMyProfessors.com that provide somewhat more reliable and valuable information. All of the particulars about the class, such as the teacher's grading tendencies and the frequency of quizzes, is available.
Introductory classes tend to follow a curriculum that is usually a cursory overview. As long as you have an interest in the subject matter, the challenge should be minimal. If you are a new student, you can do even better by taking an introduction or adjustment to the university course. The assignments tend to focus on basic things that are rather intuitive, such as how to find information at the campus library or use the campus web mail system.