In reply to Kemics:
Hi Kemics. I don't know your experience or ability... there's a few bits to avoid if your tubing. Either cos they're boney or a drop. Euthanasia. Pandoras to name just 2.
My view... it will be hard work! Its a long section and some significant sections arent do-able.
The west dart... (the section above the upper) maybe more suitable level dependant or the upper okement nr Okehampton. Mind out for Fatherford falls. Bur theres some nice slides to consider.
Theres a nice section down from Meldon res. That would also be good fun.
Whatever you end up going ...may I give you the same advice a wise man once gave me... Walk the river first... above every drop or significant hazard place a flag on a boulder then when you run the river get out collect your flag. Walk the hazard and then get back in below. It will take time and effort but well worth it if you want to continue enjoying the outdoors. ....
Particularly if you dont have experience reading white water.
Also... theres a great book. .. white water safety and rescue... might be worth a read first.
Stay safe. Have fun Jim