4 Days in Corsica in April

Yes, the mountains slow everything down. Buses crawl through them; the picturesque antique train is even slower. Yet that scenery is the real draw, along with decent beaches. Moving between one city and another is the only kind of day-tripping you will have time for.

The larger towns on Corsica are pretty far apart, so I would suggest picking one and staying in the area. Both Calvi and Bonifacio have enough to keep you occupied for 4 days, without having to go anywhere else. If Calvi, be sure to drive up into the hills above the town; the scenery and the terrain are spectacular. A day trip by boat to Ajaccio that visits the calanques is definitely worth the time and expense. If Bonifacio, be sure to take at least one boat trip. The best views of Bonifacio (and they are spectacular!) are from the water. It's pretty amazing to see the houses clinging to the cliff (from time to time, they'll lose one!). The area just north of Bonifacio has some good hiking, with some pre-historic sites that can be visited. Sadly, a car is need to get to them. But, you don't have to do it all on this trip; I can guarantee that once you've been, you'll go back. If you're flying in, the bad news is that you'll probably have to fly in to Bastia or Ajaccio, so you may want to consider those towns also. I'm not familiar enough with either to make a recommendation.