Bukit Aup Jubilee Park is a hill park outside central Sibu, built around forested slopes, ponds, and short walking paths. Locals come for exercise and weekend air rather than grand scenery, but the rise gives you a rare bit of height in a mostly flat river landscape.
It is best with your own transport or a ride-hailing car. Go early or late, when the heat is lower, and treat it as a gentle local outing rather than a full nature trip.