My first time doing Windsor too - thoroughly enjoyed it. It wasn't as hilly as i thought it would be although there were a couple of sneaky climbs and managed to match my best half time which i was pleased with. Very scenic run....had to keep reminding myself to look around a bit as it was so beautiful. Only slight negative for me was that i thought that half an hour before the start would give me enough time to queue for the loo but it didn't - they actually delayed the start by 5 minutes because of the loo & baggage queues! All in all a lovely run - a nice, dog friendly/family friendly venue so thumbs up from me
Just entered myself & partner for Beachey Head in October - we've both done a few half marathons but thats it although walk and run in that area anyway so have a good idea whats in store!