Destination Undecided

Right now, I am thinking of travelling. One route I've been planning:

Kuching-Bintulu-Sebauh-Tubau-Kakus-BAKUN-Belaga-Pelagus-Kapit-NANGA GAAT-Kapit-Song-Kanowit-Betong-Lachau-Kuching

in 13 days

With perhaps a detour to Miri and Brunei.

Any suggestions anyone?