It's Texas, and although it's not near summer yet, expect long lines on a weekend, in particular for the water rides(so yeah, Roaring Rapids, and El Assarradero (either side, since both flumes appear to be open this season) will have long waits no matter what time). So I'd save the water rides for last.
the two "coasters" that will have long waits will be Pandemonium, and La Vibora -- and unfortunately, they are opposite directions from the park entrance. Judge Roy never had much of a line, but the re-tracking (and that it's at the front of the park), might get it to have a slightly longer wait this year.
personally, i'd go for the bobsleds (La Vibora) first as soon as you get in the park, as once that line gets long, it NEVER gets shorter (unless you are doing single rider line). Then hit Pandemonium thruout the day whenever you see the line starting to be short (the loading on this is terrible, but sometimes the line does get short).
The non-coasters you list will all be walk on, or short waits (in particular, Rodeo NEVER seems to have a line, as it's kinda hidden down a cut-path near the flumes).
I personally find Space Mountain more intense than Runaway Mountain, simply due to the "effects". . Runaway Mountain is fast, but dark. . so you won't know what's coming.
and although I know you'll be there as a family, and the kiddo will likely find it too intense, you really, really SHOULD try to get on Shockwave yourself, as it's an amazing coaster, and the line moves fast.
maybe send your wife and kid up to the Oil Derrick tower (near the entrance of Shockwave's queue) so they can enjoy the breeze and the views, while you get to ride?
Titan, Giant, Mr. Freeze, and Batman are likely too intense for the little one, and the lines will be lengthy enough you won't want to leave the family to get on (a shame as all 4 are quite fun). .but hey. . family time
have a great time!
Thank you guys so much. You and Chadster have been a great help