The coastline is again mostly flat, with a few climb, never longer then 5km, major roads are sealed and quite smooth. Some areas have very nice beaches, sometimes made of volcanic sand, indeed Negros is home of one of the most active volcanoes in the Philippines, the Kanlaon Volcano (2.465m).
Getting to Dumaguete from Bohol, it's quite straight forward, two hours with the fast boat (700P), check our general guide to know more about ferries in the Philippines, and this website for updated schedules.
Our itinerary was 320km long in 8 days, including the ferry transfer. Down below is the detailed map of our itinerary in Negros, with elevation profile. It's the GPX track recorded by our GPS during the whole journey.
From Dumaguete you can go north, following the west coast, or south around the island and then along the east coast. Since the north route is the main road it is more busy, so we suggest to go south.
The first 30km are along the sea, not very inviting though, a little muddy. After that there's a short climb up to 200msl, nothing heavy.
All of this 88km up to Santa Catalina are not very developed, there are a few resort before the climb, in front of Apo island, where the sea gets better (not astounding but good for swimming) and the beaches are made of black volcanic sand.
Santa Catalina is a small market town, with a few accommodation options after the town center. There seems to be nothing in town.
Some 50km north along the coast is Hinoba An, another small town, not much choice of accommodation here but you can find something. Ask for Noni in the market area if you want the cheapest (200P) room available, not very clean and comfortable but Noni is an interesting person to talk with.
The town itself is small and with a pleasant beachfront, many seafood restaurants and a pair of perfect beaches just around the corner, we really advice to go to Sugar Beach, there's a short river crossing by boat for a small tip to be given to the local kids, you must leave your bicycle behind if you came here with it. The beach itself is huge, with beautiful rocks, golden brown thin sand and emerald green water, a paradise. Here are a few more expansive restort and most of the western tourist. If you find it wavy (can happen in the afternoon) just walk to the end, there's a nice bay where the water is usually more calm.
In Sipalay there's also Fredrik, a french touring cyclist who settled here and runs a restaurant, you can contact him through warmshower.org.
The last stretch, turning north to Bacolod, is the most boring. This is the same main road we tried to avoid in Dumaguete, which cuts the island and then reach Bacolod, the second biggest city in Negros. Very busy with trucks and lined by sugar can plantation it is anyway flat and can be done very fast (around 100km). If you wish to visit Guimaras island it's possible to take the pump boat from Pulupandan, around 23km before Bacolod. For us this was a very scary experience, we really thought we are going to sink and die, so check accurately the weather condition or try to find another boat, there must be another way, though everybody told us this was the only one.