just some days ago I started a thread in the german forum but maybe there are also some english speaking people interested:
How about having a hiking tour through the Black River Gorges National Park? As from what I heard the tour takes about 4 hours and will end around Grand Bassin. I maybe can ask a colleague of my wife about the tour and if she will assist. I went there alone recently but this is not recommendable, no cell phone reception and the path is very stony and you need to be careful.
An alternative could be Valley de Ferney but so far I have no idea about the landscape and ways there. Same with the relatively new park near Nouvelle France.
After the trip a van might be arranged to pick us up and bring us to a near beach to relax.
This is just a first idea. Every input is welcome. Earliest possible date for me would be mid July.