oh, it's way more than 350' for the longer holes. In the long pins from long tees, the course gets pretty massive; at least six of the holes I can think of quickly are over 500', and some with lots of nasty trees in the way. Holes 4 and 5 are probably 650'+ long-to-long. Even in the short, hole 5 is ~500' (slight downhill).
Course is almost 50/50 open vs. trees. Open areas are on rolling hills with lots of elevation changes and frequent high winds; the wind and elevation make this part of the course really tricky, and a nice contrast to the tight wooded areas. Wooded areas are not as much elevation, but include a lot of tight alleys and a couple of shots around a pond (including one shot over the pond in every layout; two shots over the pond with pins in the long positions).
This is a gorgeous tournament course. I would recommend playing in Advanced just so you get to play the long pins -- they are an awesome challenge and are so much cooler than the short pins that I think you'd be advised to play up a division just to test your game on the long pins. My first-ever 1000-rated round was there on the longs, in reasonably high winds. I shot a 63, rated 1002, in those conditions. The next day, in less wind, SSA for 1000-rated was just under 62 strokes.
So basically, if you're playing competitively in intermediate right now, you should be shooting in the low-mid 70s on the long layout, and in the mid/high 50s on the short layout. If you can shoot 55/70, you should be around last cash in Advanced.
I'll be out there on the Pro day. And if you're coming into town anyway, you should consider signing up for the Pro event as well... see the big guns play the course and get to play with some amazing folks. And get a few more tourney rounds under your belt. As well as the chance to fix any mistakes you felt you made the day before.
It is an awesome course and an amazing tourney -- glad you get to play.