It's the closest star to us and the easiest one to observe. Solar observing is a very interesting part of astronomy that anyone can get involved in and also contribute important data to the professional community.
Small scopes are actually preferred.
A 2-3 inch scope is perfect for the job. White light solar filters are inexpensive, especially for the 2-4 inch sized scopes. I can't stress this enough. I've heard that some people make their own, I DO NOT recommend this. I will not argue that point, it's not worth risking your eyesight.