I played around with Google Earth and put together a stadium overlay. The scale is pretty close though not exact. Here are three smaller images, and you can click on them to get the larger images.
First up is the overhead view. This is just to get a sense of scale. The line indicates the view from home plate through center field. Use the freeway interchange (Auto Mall/880) on the lower left as a reference point.

Next we have a “helicopter” view that’s similar to the shots that I posted earlier. The ballpark’s footprint looks deceptively small due to the perspective.

Finally, here’s the piece de resistance, a near-ground level view looking east. Yes, Virginia, those are hills. The line terminates at the top of Mission Peak, which is 2,517 feet above sea level and makes for one of the more popular hikes in the area. The “crow flies” distance from Mission Peak to the site is 4.7 miles. Contrast this with McAfee Coliseum, which is 3 miles from the Chabot Park hills in East Oakland. That ridge rises to just over 1,100 feet at most. Leona Quarry is around 800 feet above sea level.

In a place that lacks skyscrapers, at least it’s something to look at.