Always amusing that sea elves and tritons don't get dark vision whe. It's 101 basic knowledge that light from the sun doesn't penetrate the ocean very far. I can imagine elves, tritons, and saughhuins bumping into each other all the time inthe dark ocean depths.
I like the bonus action. I can all to easily see special attack manoeuvre, and the special movement manoeuvre feature, and then racial or class special manoeuvre creeping in and making some complex.
The iniative system on the table Mike Mentioned added up for more to players and DMs to remember...