Hello,
I read all the posts above. I will try to suggest improvements for the design I like and describe what I do not like.
First of all, I am a skateboarder since 1987 and have a great respect for BMX as well. I think a lot of the animosity we experience can be cured with a good park design.
It's important that the park is no so open concept that a runaway board gets under bike wheels. It's also important that there be enough separate areas to avoid collisions. Large open areas have a way of getting cluttered up with the less experienced kids that don't understand the 'lines' in a park. A large area of flat is not what I go to a park for. There's plenty of tennis and basketball courts and street around for that.
'Flow' should exists in a few areas so several people can let loose at once. I enjoy the Lewiston Park because of it's great flow but it is a collision course if you run it through on a busy day.
With that said: Here's my take on the current designs offered:
I don't like #1. A mini is always a staple feature but near a square bowl, its shape is redundant.
I don't see a need for the covered shelters. They simply attract homeless folks and other behavior. A completely covered park would be useful... but an umbrella in the corner is pointless IMO. Lots of open space here. I expect a lot of crashing and spoiled approaches.
Not a huge fan of #2 but it's better. I'd swap the bank features at the opposite end of the bowl, make the center portion flat to create a cooler gap. The figure 8 bowl is cool but many will miss the mini ramp shape. The overall flow is just back and forth and pretty stock.
So me, I'm a fan of concept #3. In theory anyhow. I like the high ground in the middle and three or four possible directions. The clover bowl is cool IMO because it essentially provides both a left and right hand kidney as well as the mini-ramp shape and hips. I'd drop the park benches in favor of concrete benches (with and without backs) and probably kill the shelter too. Might be nice to add in some more trannies like a spine and a box would do well for the bikers. Is that supposed to have plush green grass and pretty landscaping? I'm not sure that's such a great idea. I like how the overall shape is 'crop-circle-ish'. It's creative and creativity has always been a big driver of our sports. Take a look at the outer circle at the bottom of the stairs. Seems to me you could carry a lot of speed from the center, take a couple of optional routes past a couple of rails and stairs to get there. Then it's sort of a dead end. Why not grow a quarter bowl there that tapers to the ground at both sides.
After you've just put down a nice line of tricks, whip around or turn back rather than heading home.
This off the top of my head. Perhaps it will at least spark some additional, constructive commentary.