Short answer: St Austell is a working town; the visitor draws are Eden, Heligan and Charlestown just outside it. Book Eden online for cheaper entry, and note your ticket converts to a year's pass.
St Austell itself is functional. What makes it worth visiting is what surrounds it.
The Eden Project: book online, which is cheaper than at the gate. Your ticket converts to a year's pass, so it's worth returning if you're in Cornwall again. Car parks are large and a genuine walk from the entrance, with a shuttle in peak season.
Charlestown: a preserved Georgian harbour a couple of miles out, and much more appealing than the town centre. Parking is limited.
Getting here: St Austell has a main-line station.
Booking: the Charlestown pubs get busy in season. Par Market opens Wednesday, Saturday and Sunday only — a common trip-up.
There is no single standard fee. Charges vary by car park, by operator and by season, and this catches first-time visitors out constantly. What to know:
In peak season — roughly late July to the end of August, plus school holidays and bank holidays — yes, for anywhere you actually want to eat. Cornish restaurants are mostly small, and the good ones fill.
Outside those periods it's far more relaxed, and you can often walk in. The exceptions that are worth booking year-round are the well-known destination restaurants and anywhere doing a Sunday roast.
A practical point people miss: many Cornish kitchens stop serving earlier than you'd expect, particularly out of season. Turning up at 8:30pm in October can mean finding the kitchen closed even where the bar is open.
Main roads and towns, yes. Beaches, coves and smaller attractions, often not — and satnavs can be actively unhelpful in Cornwall.
The specific problem: satnavs routinely route drivers down single-track lanes that are technically the shortest way and practically a nightmare, particularly with a hire car in summer. Following brown tourist signs is usually better than following the satnav for the last few miles.
Phone signal is genuinely patchy in west Cornwall and on the moors, so downloading offline maps before you travel is worth the two minutes.
See the full St Austell guide, filtered by who's with you.
Plan your day near St Austell →