Done at night with a battery powered boat down the river. you'd need to organise this through one of the local travel agents.
Kuantan River Cruise
There are several a day.
Taman Gelora
Located about 3 km from kuantan along the way to teluk cempedak, is a beautiful park called gelora park. various sport activities can be carried out here including jogging, aerobic dance, tennis, beach volleyball,etc. you can admire lotus flowers here too.
Cherating - Turtle sanctuary
This is seasonal. head towards club mediteranee and it's just at that resort's entrance.