I will join Piglet and Keith on that Eau Rouge camping again this year. I hope to arrive a couple of days earlier than last year, to catch the parade to Spa. It's a brilliant event with a nice relaxed atmosphere and a must for everybody who appreciates GT racing.
Parking is not a problem at all, there are many places to park all round the track, so it's best to decide first where you want to be at the track and then decide what parking suits your needs most. I'm not sure if I paid extra money to get into the paddock area. If I did, it was worth the extra money. That's where the party is Saturday night and you can easily go from there to the (formerly known as) Bus Stop, Eau Rouge and La Source hairpin.
If camping isn't your thing, there are many very affordable hostels and hotels in the neighbourhood. Food is generally very good, unless you order the odd Mexicano. Stay away from that, ask Paddy for details.
And of course it's a great beer country. Try them all or give it your best shot!
It's hard to compare the event with anything, but if the words Spa-Francorchamps, Belgian beer, great food, relaxed atmosphere and top of the bill GT racing mean anything to you, join in!