Advice on London/Paris Itinerary

Versailles is not a full day for some travelers, it can be done in 4 to 6 hours, although a full day would be nice.You said day trip to the Cotswolds from London: that's an awkward day trip to do on your own using public transportation. Would be best if your friend can drive you there.The problem with trying to do it on your own using public transportation is that you can get to Moreton-in-Marsh from London by train, but the rest of the Cotswolds are (basically) not served by rail, forcing you to use the bus system, which is doable if you had more time but not when you're trying to go to Moreton by train, then get around the Cotswolds by bus, get off the bus to do things, wait to get back on the bus, then back to the train station Moreton, blah blah blah. I think there are bus tours from London that can get you to the Cotswolds and back in a long day. I haven't used them but you can google and find them, here's one day trip bus tour to Cotswolds from LondonBut best to have your friend drive you to and around the Cotswolds.

This sounds like a good itinerary to me, though personally I would add 1 more day to Paris and less to London. And, personally I think Versailles is pretty much a full day trip -- for touring the chateau, the Trianons, the grounds, and sitting around having a nice lunch if weather is nice ... you can't fly through the place, particularly in June I would guess.

The trip does sound great; but for me I would
add 2 more days to Paris and less to London!

Is that five days in London and only three in Paris?? I would do two in London, two outside London( Bath on your own, and maybe the other day with friends they could do as Kent suggested) . Then add extra day to Paris. Personal preference.

Versailles can be done in 4-6 hours, but its nice not to have to rush .Alot depends on day of week and weather. If it is rainy or cool then Chateau can be done in 2-3 hours, who would want to wander the exstensive grounds in bad weather though. Le Hameau ( Marie Antionetts petit village) is all outside too. So a half day would do it, but on a nice day the grounds and out buildings etc would definately be worth another 2 or 3 hours, plus if its a Sat or Sun then you have the fountains to enjoy.

Britrail used to have a 1-day trip to the Cotswolds; their guides are very knowledgable.

London: do get tickets for The ceremony of the Keys at the Tower of London; you must order ahead---check London Tourist Authority

Versailles; plan a whole day so you have time to enjoy the gardens

Paris: Musee de Moyen Age (Cluny) if you like medievil history; Musee de Marmottan if you like Monet

Itinerary sounds just fine to me....

Thanks everyone! I should clarify that it would be 6 days in England (I'm thinking 4 days London including the day that we arrive, and then 2 days for the countryside). Then 4 full days in Paris (this is not counting the last day that we leave to go back to Canada).

Perhaps, it is a little on the heavy side for London, so we may add an extra day in the country side, or one more day for Paris.

I don't think anyone is suggesting that you'll be bored with 5 days in London, but that 3 days is too few for Paris.