Bungie.net : Bungie Online : Halo 3 File Details
This is the first map I've posted on forgehub and is the first map I've made in general. It's a racing map that takes players all through Avalanche in a single lap. It can be a little confusing the first time so I'm including a guide in case anyone gets stuck:
At spawn, hop on a mongoose and take the ramp onto the mancannon. You should land on a closed in area. Take a left into the doorway and go across the next mancannon. Take another left and drop off the small ledge. Continue through the series of open boxes and drive up the watchtower base. Go through the open box and take a left. Keep going along the straightaway (right next to where you spawned) and take a left, followed by another straightaway. The track goes on to hug the glacier that separates the two sides of Avalanche. Dodge the trees and go up the ramp with the gravlift at the top. This pushes you onto a bridge (don't fall!) above some previous track. When you drop down, jump the bridge (again over a previous part of the course) and navigate the open boxes. Jump the ramp with the gravlifts and continue along the straightaway. Turn left along another straightaway, which leads you into the attacker's base. When you reach the top of the base, go into the mancannon and continue along the track until you get into the teleporter room (marked by custom powerups) that would normally bring you back the base you just left. You're done! Entering the teleporter brings you back to spawn and you can begin another lap.

It's not as complicated as it sounds and the track is pretty obvious through most of it.
Just don't expect it to be too aesthetically appealing. I'm only beginning to hone my forge skills. Hope you enjoy!

Edit: I added the Img codes. I also deleted all my other posts. I actually did read the Rules, I just thought that it was only double posting if there wasn't a post from another person in between my posts. Sorry. If anything else is wrong please let me know.

Edit (again): God, a 1/5. Could whoever's played and rated post what I should improve on and where? Apparently there's a lot.