I would stay at Ladram Bay - lovely caravan site in East Devon. Not too big but with a small shop, cafe, restaurant/pub and indoor pool.
To visit there is Pecorama - model trains, indoor and outdoor play Bicton Gardens - train ride, indoor and outdoor play Crealy -theme park usually has Halloween activities on incl a free pumpkin (!) Escot - great outdoor fun for children incl a maze Exmouth - boat trips up the river Exe and a traditional seaside resort Exeter - museum (not that great but others may think differently) Unerground passages, Quay area with kyak hire
I have family in both north and south Devon. North Devon is better for beaches etc but south Devon has Plymouth - aquarium, the barbican, the ho with the lighthouse etc, Torquay area with babbacombe model village, Paignton zoo, and both Torquay and Plymouth have good swimming pools.
My DS has decided that he wants us to go to Devon on holiday. I've not been since I was a teenager. (went by train on a PGL type holiday and stayed in a boarding school in Sidmouth)
I am open to any suggestions for areas to stay, and places to visit. He loves trains/planes/boats/buses along with the usual playgrounds etc. He's not overly keen on extended trips to the beach but would love a port/harbour.
We're not keen on hotels, but campsites, cottages, holiday parks, glamping are all good.
We will be travelling from London. Will a long weekend be long enough, or will it take us a week to recover? (I've been reading the driving to Cornwall thread)