Most campsite boundaries are well marked. If you're not sure of the boundaries, ask neighbors, or as a general rule of thumb, line up your sewer and electrical hookup with the guidepost.
When connecting sewer and electric, keep it tidy. Typically your sewer side is the patio side for your neighbor. If you think it looks trashy; your neighbor probably does too. If you're in a small site, don't extend your awnings all the way, and if possible, bring in your slide when you're not inside the coach (your neighbor will thank you for the extra space).