I've been bringing my 3-year-old there since he was 2. The small pump track is perfect for little ones with balance bikes. It's a great place to bring young kids, but they do need constant supervision. Your 4-year-old should be fine as long as you attend to him at all times and keep him from getting in over his head with the bigger jumps, etc. Have fun!
Yes there is a small track located to the side of the larger track. It has less aggressive roller style mounds with mild burms. It has plenty of room for you to follow along his/her side. I suggest you walk the track a couple times to flag any ruts or muddy spots that can catch their tires. Definitely a great track to show them the basic feelings of riding on dirt.
Yes. There are less aggressive side tracks or "pump tracks " as they are called that are great for beginners
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