You have to remember that this is going to be a BUSY weekend for the whole town! There are car parking area's around on side streets etc, do look out for any parking restriction signs though! There will be a number of parking attendants (and traffic wardens and police too) on hand around the park area, ask them for help if needed?
Last year saw around 7000 people attend over the weekend, the weather this weekend is supposedly (via BBC weather) reasonable to good, so do expect a LOT of traffic and indeed people! The best advice I can give is to arrive as early as possible to 9am, when the race weekend starts. That way you'll have a better chance of finding parking nearer to the park.
See you there and do have some change ready, as our new charity Blood Bikes Wales are launching at the park and we will be asking for any donations, if you can spare any, to get us going

Is there car parking available??