The end of March would be perfect for hiking and there are many easier trails to do.
We like to stay nearby at Dead Horse Ranch State Park in Cottonwood. Nice views and a lovely park. At night you can see of lights up the mountain in Jerome. It's also more reasonable than a Sedona park would be. It's a pleasant drive - perhaps 20 minutes or so.
For breakfast in Sedona try the Coffee Pot restaurant (not open for dinners). It has a wide menu and a casual place with excellent food. It's on the west side of the highway.
Here are the historical averages of temps:
Intellicast - Sedona Historic Weather Averages in Arizona (86341)