Local Routes
The map below is a prototype, a beta test, or whatever weasel-word you use to indicate that your best effort may still be riddled with flaws!

The bottom line is that all distances are measured from the Beach Shelter. Anti-clockwise routes are in red, orange, red and green with appropriate intermediate distances indicated. The final distances are at the Beach Shelter. Clockwise distances are in blue and purple. I'd be grateful to hear from anybody who has suggestions and improvements to make. Indeed, if you come up with a better scheme, we'll publish it, laminate it and hang it at the Beach Shelter.
A rough rule is that E1 is 2 km from the Beach Shelter is 2 km from the ramp. One more km puts you opposite the BSRC and another 2 km puts you in the Seria River. It's about 0.5 km from the beach to the middle tracks and roads of the camp. Add 3% for curves and bends. Although the beach appears to be a firm running surface, it does slow you down, and each km is worth about 1.1 km on tarmac.