checkout shorefield holidays, I stayed at New Milton, it was ok, cafe on sea front at Barton on Sea green,(*beach not really sandy), also a nice restyrant *(apparently) is walkable(dist), easy cycle. (*edit its chalets etc holiday camp)
Brockenhurst ye olde foreste scenarioe and for disused railway cycle (*can go off piste to Lyndhurst with a bit of cheeky but watch out as cheeky in NF is £500 fine I think and the verderers are like very offensive traffic wardens that have a wasp up their jackies with a depressinhly strong ownership of ‘common land’)
there could be a company who advertise on ebay BUT ready carefully as the ads could be worded as the price per per person but you must have x people….