I'm a big fan of the palms. Sure, they're out of place alongside oaks or cedars, but in an urban environment, they look nice alongside tall buildings. They can fit in tight spots while providing vertical fill, something that oak and cedar cannot do.
The railroad trestle at 3rd street is great, but when urban rail connects to Seaholm, they'll probably have to upgrade or replace it. The shoal creek conservancy talks about the High Line comparison
here. It's a nice concept and I would compare it to more of a pocket park than the High Line.
I hope third street remains pedestrian, I think it's important for the character of the area. Reducing vehicular navigability through an area isn't just a NIMBY attitude; it can help preserve character of a destination like the Seaholm complex for everybody.