Preventative medicine is often a large part of what a good health clinic offers. Most are willing to perform wellness tests, and at the very least should be able to provide you with health guidelines for your age and size. There should be plenty of free brochures on display, too.
If you're looking for a good health clinic, check your insurance provider list first. Many HMOs and similar providers publish lists of health facilities in your local are where your insurance is accepted. Once you've located a good candidate, it's a fairly simple process to visit them and check them out.