sounds like a great idea and also a good way to see parts of the world!
Personally i have done Berlin (2013) and London (2014) myself, which I would wholeheartedly recommend -
Berlin for the time and organisation, great course and atmosphere, also recommend having a watch at the rollerskate marathon the day before! London for the sheer scale of it, probably not a PB event, even if the course is relatively flat - just one to enjoy in my opinion
I have also done Belfast 3 times now and wouldn't recommend it for your list...
trassey - i got 4.82 miles in total, still a tough tough run though!
races coming thick and fast now, is anyone else for the Jengana 10k this saturday in Antrim? Done the first one last year and its a pretty good course, got a roasting day last year and forecast has it looking similar for this saturday!
have to agree with nattybow, organisation leaves a lot to be desired - my 4th Belfast marathon, and first since doing Berlin/London, and maybe its spoiled me, but between the mile markers being wrong at 5 and 7 (amateurish mistake) and being handed a cup of water only for it to have bits of stone and grit in it, then handed the incorrect medal at the end...cant say i enjoyed it!
still managed a PB by about a minute over London a few weeks back, legs certainly went from under me about 20 miles, but as much as im happy with the PB, its disappointing to see what could be a great capital city marathon be handled so badly,
to end on a positive though, despite the conditions, the support from the locals was absolutely superb, and im glad to see the numbers taking part rising, both in the marathon and relay, great to get people out running in Belfast