Just another couple of thoughts, to help with interpretation of his proposals, if he does come up with any. I have worked with woodland owners over the years, mostly farmers and conservation bodies.
Firstly, is it a commercial plantation, probably conifers in straight lines, or a woodland, with a mixture of mostly deciduous species? It's too small to be really commercial as a plantation and rows of conifers will be less fun as a camping location.
Secondly, if mixed deciduous, there are a number of activities that form part of good management that it is possible to get some return from, including cutting for firewood, providing wood for wood-chip heating systems, coppicing and making charcoal or coppice crafts (fence panels, baskets etc) and keeping pigs. Just be aware that while it possible to get madly enthusiasitc about these ideas, they do not offer big profit margins, their viability will depend upon existence of a local markets your DH can exploit and availability of a local contractors and artisans, unless he wants to do all the work himself. Even on farms, where farmers do sell firewood etc, they don't make much from it, it's usually more a way of getting something back for work they'd be doing anyway and viability varies a lot according to local markets.
If he just wants to let it all grow wild, not do any management and not claim any grants, that is possible but won't make as interesting or diverse a woodland as management would, at least for many, many decades.