Trails in Sandy

I got a kx100 bike last monday and haven't been able to ride it yet. To get into MX I had to sell my mountain bike. (I was a fairly skilled mountain biker if that helps with mx) I can't drive yet so that is a disadvantage. Also, my dad doesn't ride so it is even harder. My mom is willing to take me somewhere to ride as long as it is under 40 minutes away from the Sandy area. Can you tell me about good beginner trails that are close by to ride? Also, We come to Manilla, Utah (Flaming Gorge area) because we have a second home up there. I would also like to know of some good riding around there. My dad might get a Yamaha Rhino and ride with me like I follow him or something.

Thanks