Ok, last week, DH and I drove what we could of the course and here's my report:
-As soon as we exit the parks, we have a pretty big hill to conquer (uphill first) that goes over the freeway, so bring all that park pixie dust with you
-Once we make the turn onto Cerritos, there's a little hill and some railroad tracks to cross. These are not your friendly Disney railroad tracks (which can take out even the most seasoned park goer

), these are uneven and have asphalt sticking up around the tracks, so be careful!!
-After we turn onto Lewis, there's a pretty long hill (downhill first) that isn't terribly steep, it's just long
-When we turn back onto Cerritos (after mile 8), we come across those dang railroad tracks again. Watch your step!
Pretty much all of this part is wide open streets with very few bottle necks. Once we go through the Honda Center area, we'll head onto the Santa Ana River Trail. I do all my long runs on this trail, and I have to say, this portion of the trail is my least favorite

We'll enter going downhill and yes, there's a turn around at the end, but it's wide
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It is designed to make the turn easier for cyclists, but since it's paved the whole way, it's easy to cut across right behind the sign to make the turn shorter. This isn't too steep, and is spread out over 2 portions of the trail. (This pic is from the turn around looking back towards where we would enter on the right past the trees)
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So we continue under that bridge and then have a steep hill to get back up to the same level, but in way less distance. (Second pic is looking back from the top of the hill.)
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Then it's nice and flat for just a bit, and depending on how they take us off the trail, we may have another hill that's short, but steep.
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Again, I'm not sure how we'll get off the trail as there are a couple places to do that, but I think this whole trail section will be the worst place for bottlenecks.
Then heading into the parking lot of the stadium, there's a bit of an incline, but once we're done there, I think it's pretty flat. And yes, things have been pretty chilly here, but I love it (the cold never bothered me anyway

) and there have been possible forecasts for rain, but that keeps changing, so I would say bring layers and be prepared for rain. A lot of the course once we're out of the parks won't be shielded from the sun (once it shows up) so keep that in mind too. Can't believe we're so close!!