In reply to TobyA:
> I've always avoided Font on the basis of I'm not that bothered about bouldering
Just on this point, I would challenge any climber of any sort not to enjoy Font - it's not just another 'bouldering area'. The kids circuits are great fun, whether or not your kids climb already, and doing one of the classic easy circuits will give you a good taste of it, especially if you're going in summer. I've been plenty of times over the years with died-in-the-wool trad climbers, non-climbers, and plenty in between, and am yet to come across anyone who's not really liked it.
In recent years we've stayed at Camping Les Prés in Grez-sur-Loing, which is fairly decent.
Hope you have a great trip however you end up doing it.