As an AI language model, I don't have personal opinions and cannot verify information across multiple independent sources. However, here is a summary based on information from various online sources:

Fair Hills Fairgrounds is a popular outdoor event venue situated in the state of New Jersey. It is a sprawling 30-acre site that offers a wide range of recreational activities, entertainment, and events throughout the year. The fairgrounds are located in Washington Township, Warren County, and have been a popular destination for visitors from across the region.

Some of the good reasons to visit Fair Hills Fairgrounds include their annual events such as the Warren County Farmers' Fair and Balloon Festival, the Hot Air Balloon Festival, and the NJ Wine and Food Festival. The fairgrounds also host a variety of events such as craft fairs, food festivals, and music concerts throughout the year.

There are several interesting points of interest to see at the Fair Hills Fairgrounds, including a petting zoo, carnival rides, a cultural center, and a farm museum. Visitors can also explore the different exhibits, demonstrations, and competitions that take place during the various events.

One of the interesting facts about the Fair Hills Fairgrounds is that it is one of the oldest fairgrounds in the country, dating back to the mid-19th century. The fairgrounds have a rich history and continue to be an important part of the local community.

The best time of year to visit Fair Hills Fairgrounds depends on the specific event or activity that you are interested in. For example, the Warren County Farmers' Fair and Balloon Festival take place in late July and early August, while the Hot Air Balloon Festival is usually held in July. The NJ Wine and Food Festival is held in September. Visitors can check the fairgrounds' website for a full calendar of events and plan their visit accordingly.