going down to port a for a couple days, any advise on getting into some reds and trout?

Try reviewing this online book Fly Fishing the Texas Coast: Back Country Flats to Blue Water

have you ever been?
do you know your way around?
are you wading, or using personal craft, or fishing out of a boat?

etc.

I know it pretty well I'm thinkin jetties or wading somewhere?

For the jetties, early morning might be good for fly fishing otherwise I would try to find some shoreline to wade. If you had a kayak or could get over to the estes flats or traylor island, I think that'd be your best bet.