Ok yesterday I went to both parks before/during the storm to check them out:
Here's my quick review:
Disclaimer, I liked Mary Heads better (because I had my son and he loved it) - I also think if we look outside Carrollton we might be able to find an even better park. I felt both would work really well - but my worry is the guy telling us we can't reserve McInnish.
Mary Heads - large probably 15-20 tables one children's table under the pavilion, covered and partially covered pavilion, three very large grills at each end of the pavilion, womens restroom had no doors on the restrooms and two stalls- I can't speak of the mens, large pretty awesome playground as an added bonus its adaptive, a small pond of sorts not large - I didn't see any fish but I didn't look for long, large area of treeless field, playground, small pond, smallish field with a concrete walking trail around it. Renting pavilion is $100 deposit $50 per hour, parking probably had approx 30 spaces but directly across the street a pre-k building had parking available as well.
Link to pictures of Mary Heads: https://drive.google.com/drive/folders/0B-9lwxsfTaRgWWNsQW1kdW5wODA?usp=sharing
McInnish - Massive huge complex, so big in-fact it took me a long bit to find the two pavilions in the park - one is at the very front one and the other is located in the "soccer complex", parking wouldn't be an issue at all, I will check to see if the pavilions are rentable but I've had mixed stories. It is near a beautiful walking trail but that is in the middle of the park - at least 15m walk from either pavilion. It started raining really quickly after we found it so I wasn't as good with the pictures.
Link to McInnish pictures: https://drive.google.com/drive/folders/0B-9lwxsfTaRgdFJLbXQwNS1RZjA?usp=sharing
The first large covered pavilion had probably 8 tables, trashcans were close but I couldn't locate any nearby grills and the restroom was a bit of a walk, next to a nice dog park and three baseball fields and a massive lake is within walking distance (probably 7minute walk) - this lake looked a bit questionable with a few industrial tanks near it, lots of parking, If it's not rentable I could see a huge problem with it being occupied by sports parents.
The second pavilion was also covered and had several different picnic tables around with standard "park" grills around. It takes a bit to get to once you enter the park. It had probably about 8 or so tables and a nearby restroom (we didn't get to go in - it started to storm on us) it had a good playground within eyeshot of the pavilion. Had several concrete picnic tables around, large amounts of treeless open space.