As CM says, it's an easy intro into going foreign. LFAT are very used to British visitors - they even get to know the regulars "Ah, bonjour G-UTSY, join downwind right hand runway 32, the taxi is there."
"Customs" is there till about 12:30, then he goes to lunch. Technically, you are supposed to wait till he gets back, but I've found the smiling folks at the fees desk will take your details, and when I've left the douanier has been friendliness personified.
ATC - talk to Lille Approach, who probably will do no more than give you a squawk and then tell you when to call Le Touquet Tower.
Car hire - if you're going any distance, I think it can be done. Bicycle hire is also available for those not going far. There are several taxis serving the town, too.
Accommodation - don't know. Never stayed overnight in LTQ. There are hotels, pensions, etc - and lots of French folks stay there so they can't be all that bad.
Good pubs - dunno. I tend to frequent the restaurants and cafes. Plenty of those. I like La Petite Charlotte and L'Harlequin. Perard's is also well worth a visit.
Aircraft parking - there's a set of tie-downs on the apron with a hawser running along, so take ropes.
As CM says, you can't camp there cos the apron (very large) is tarmac.
All in all: a very easy trip and an enjoyable one.
Be ready for the engine to realise it's over the sea and tease you by sounding rough as you coast out. Be ready also for the horizon to go all vague. A bit of IFR training on use of the AH can make life easier for the crossing.
Le Touquet has just moved all its VRPS (again) but you're not likely to need them unless vis is bad and you have to go SVFR - which then ups your vis minima so you can't anyway
