My perfect second or third date would involve cycling (of course) along the canal paths or over to Highgate Cemetary (the tours are good) or the Chelsea Physic Garden, a city farm (Surrey Docks Farm is lovely as it overlooks the river) or along the Green Way to the Olympic site. The date would also involve coffee drinking, lots of south east asian food and possibly a movie or V&A/NPGallery if it's going really well. To be honest though, if you are getting on well with someone I don't think it matters what you do.
Meeting the family too early can be a bit hardcore though, as is introducing the date to your entire back catalogue of Acid House, Blues ballad, bitpop, new Romantics, Christian hip hop, Deathcore, or whatever music genre you are in to really, especially anything 'experimental'. I have been introduced to some of my favourite artists by bfs but not when it's been forced upon me.
And please don't show me your entire collection of Rapha until I agree to move in with you. Merino and lycra are for relationships not dates.
Oh yes, and don't mention the 'L' word or marriage for at least 5 dates.
ftfy