When to Go to the Thames Valley

High summer is lovely, but droves of visitors have the same effect on some travelers as bad weather. Consider visiting in late spring or early fall, when the weather is not too bad and the crowds have headed home. Book tickets and accommodations well in advance for Henley's Royal Regatta at the cusp of June and July; Ascot's Royal Meeting in mid-June; and, in late July and early August of 2012, the Olympic rowing and canoeing events at Eton Dorney near Windsor. Visiting at Eton and the Oxford colleges is much more restricted during term time (generally September to late March and late April to mid-July). Most stately homes are open March through September or October only—call in advance if you're planning an itinerary. Avoid any driving in the London area during afternoon and morning rush hours.