Similipal is a tiger reserve and biosphere in the hills of Mayurbhanj, and it is on a scale that changes how you have to think about visiting it. It is not a park you drive to, look at, and drive back from. The forest interior is large, the roads through it are slow, entry is controlled, and where you go in determines almost everything else about the trip — which side of the reserve you see, which waterfalls are reachable, how far you drive on the day, and where you can sleep.
That is why this guide spends more time on the question of the entry point than on what there is to look at. Visitors who plan Similipal as "a day trip from Bhubaneswar" or ask for a taxi "to Similipal" have usually not yet met the thing that will actually shape their trip, which is that the reserve has separate approaches a long way apart and they are not interchangeable.
Getting there
The road journey from Bhubaneswar runs north on NH16 to Balasore and then inland on NH18 towards Baripada — about 250 km and roughly five hours to Baripada itself, which is the usual base on the eastern side. The Jashipur side, on the west, is approached differently and is a further drive again. Whichever side you use, the last part of the journey is on forest and hill roads inside the reserve, which are slow by design; the distance on the map bears very little relation to the time it takes.
When to go
Similipal is not open year-round. The reserve closes to visitors for part of the year, and the open season, the entry timings and the permit rules are set by the forest department rather than by any operator — so confirm the current position for your dates directly with them, or through the accommodation you book, before you commit to travel. Winter and the cooler part of spring are the usual visiting window. Do not plan a trip around a season stated on a travel page, including this one, without checking it first.