Anywhere between Sukhumvit Soi 5 - 26 and you'll be fine. Might not be able to walk everywhere, but you can use the skytrian when you go out at the start of your night and take a taxi back to your hotel. After all the clubs close there is generally no traffic and when you start your night there generally is lots of traffic so try to be near a bts station (skytrain) and you will be fine.
BTS Station Nana - Nana plaza, Eden club and beer garden (good for
afternoon delight)
From nana station you can walk over to soi 11, thats where Bed Supperclub is and also down the same street you will find Q bar.
BTS Station Asoke - Soi Cowboy
In between Nana and Asoke bts stations just before the turn into soi 15 there's a club called Thermae, also good for FLs.
Of course there are other places to go to as well but try using the search function first and see what you come up with. Explore and enjoy your trip
