I deciced to re create the bracelet idea, so its even not like when I used the 'bend' tool in Rhino. First I  started with some basic measurements, taken from my own wrist, then using the curve and line tool I created this curve. 

I extruded it and added the 'path blocks' using the box tool, rotation and mirror tool. Ever so slightly had to make adjustments, due to the filleting I have done. I filleted the edges where it sits on the wrist. Top right is 1mm, left 2mm, bottom left 3mm and right 4mm. 

Using the bend tool, I bent the path according to the form. I had to make some adjustments and rotated a few singularly. Then I Boolean Differenced the two forms.

The designs with the filleting and holes.

As for the LED's in this object they would be in the bigger holes probably around 10 or less LED's in total.

As I have more ideas in portraying the river I also did the river path one using the 

Just like the previous design I used the bend tool to shape it to the form.

Using the same shapes as before I Boolean Difference the two shapes. 

As I want them to be hollow so I can put the circuit in there I extracted the surface of the bottom shell. For the objects to be printed the surfaces need a thickness. To create a wall I used the offset surface tool. Exploded the whole object and boolean union it together again.

Close up of the wall thickness. I first used the pre set from rhino 1mm. And will see how the model will be printed. 

In this model the LED's would be shining through the material form underneath. These will be connected to the bottom shell that clips out. The speaker will be on the side of the object, I'm going to recreate this using the laser cutter, I'm going to draw a basic speaker shape representation in Adobe Illustrator and cut it either on plywood or acrylic. The switch is going to be one of the path blocks and to make it more visible and say 'push me' I'm going to print this out in black.