There are a number of schemes, e.g. such as those run by the RSPB and The National Trust. Activities can include footpath construction and repair, sand-dune stabilisation and work with birds or animals. Most schemes do not pay a wage. An example is sail training schooners. Expensive but worthwhile.
Obvious examples are secretarial, computing, cookery and business studies.
Courses are of varying length. Paid work abroad. This is not always an easy option, partly because many countries have an unemployment problem. Outside the EC there can also be restrictions on foreign workers. GAP deals with many countries, including Australia, Canada, Chile, the Falklands and Israel, with work such as farming, office work, conservation, assisting in schools, English language teaching and helping people with special needs.