All campgrounds must offer basic amenities like bathrooms and some type of water supply. However, you might find that if you cater to certain types of campers or customers then there are additional services that they will expect. For example, if your campground is more popular with families then it might be a good idea for you to include free activities like a pool, playground or other equipment. Plus, if you allow pets then having a designated area for them to play might be a good idea as well. Additionally, providing power hookups similar to that of an RV park can expand your customer base.
If your campgrounds are more popular with luxury campers, then it might be a good idea to invest in amenities like WiFi access, cable television hookups, and pools or hot tubs. Remember, the goal is to have customers continue returning year after year so if you can provide them with things that they will hopefully return annually.