It depends on what you like to do. If you like driving and won't be doing anything in Terra Nova Nat'l Park, The Road to the Shore Drive or The Road to The Isles then you could probably do it in 2 days with stops in Trinity, Elliston (lots of puffins and don't forget to do the Maberly Scenic Loop... the road is awful in places) and Bonavista ( and Dungeon Provincial Park). If you have more time I'd do Dunfield (long gravel road to Fort Point Lighthouse-nice view of Trinity. Admission to lighthouse). Trouty, New Bonaventure (The Random Passage Set). If you like to hike I'd add another day to do the Skerwink Trail (Trinity East) and the hike past the Random Passage Set. Port Union was an interesting, fairly short stop, about an hour. Route 238 up to Elliston was pitiful! Potholes covering the entire road, shoulder washed out, just a mess but I drove it anyway. Actually, many of the roads were in horrible shape! English Harbour (heading to Elliston, after Trinity) was colorful and a beautiful spot with lovely, old renovated homes. If you still have time I found Salvage to epitomize what a Newfoundland outport should look like. A very pretty spot but a bit of a drive in off the TCH (Rte 310 after Terra Nova Nat'l Park). My sister and I did this stretch in 5 days and found we did all we wanted plus lots of stops. We stayed in Trinity for 3 nights, Bonavista for 1 night and Bishop's Falls for 1 night. Hope this helps and have a wonderful trip.