Park at Les Bains Jaunes above Saint-Claude. The road continues but was closed when we were there due to landslides.
Pass the baths and take the only path that goes up into the forest.
(1) After the footbridge, ignore a trail that descends to the right. The path climbs until it leaves the forest. You will then see the Soufrière and rejoin the road, which is currently closed.
(2). At the end of the car park, take the path heading north towards the volcano. A few dozen metres further on, take a right to see the Virgin Mary statue that protects Guadeloupe from the volcano's mood swings.
The trail runs along the western half of the Soufrière cone, climbing upwards. Some sections are quite steep and narrow. You will also find a few switchbacks and a chasm, evidence of a past eruption.
(3) Once on the northern flank of the volcano, a trail leads to the summit. This part is much steeper, and you may need to use your hands at times.
(4) At the summit, follow the marked trail around the crater. You will see desolate landscapes that contrast sharply with the green and blue surroundings. The main chasm is particularly impressive, as are the vents that spew steam and sulphur with a noise like a jet plane.
Enjoy the view: much of Guadeloupe and some neighbouring islands are visible on a clear day.
Return via the same route to the car park (S/E).

. If the weather is overcast at the summit, don't hesitate to brave the cold and wind to wait for a break in the clouds and admire the fumaroles and the chasm!