-( Story related, cannot be missed )-
Level: Mountain Pass
Your first instance in the Mountain Pass will pit you against three Flying Lurkers as they attempt to reach the end before you to signal the detonation of the pass. They stall quite often, so this won't be that great of a threat. Your greatest problem will be the Dark Eco containers found throughout the course, and, sadly enough, the hazards such as the trees (at least, they were more of a hindrance to me). Try not to worry too greatly about the Precursor Orbs or Scout Flies this early (as you will need to turn on the Yellow Eco vent in the Snowy Mountain before you can complete this area). As you get further in, the bombs become more of a threat, so glide through them as best as you can (avoiding any real distractions at first) until you mow over the detonator. AFTER that, feel free to go back and collect everything else you need/want to.