AO NANG is possibly the 'spot' of KRABI - at least for the moment.
It is the smaller version of Patong in Phuket, Chaweng on Samui, or the Night Bazaar od Chiangmai.
I, personally like it and hope that it remains small the same way as it is although there has been an extension to the stretch.
Like any other night spots AO NANG is much more humble and the stores and people there are much more smiley than wanting to make a hard sales like they do in other places.
I didn't do much of a spree or was dazzled by much of the stretch (been travelling in this lovely kingdom for years, one can seem to get more than just the jist)...i enjoyed reading signs - some are a crack up...see photo and go figure!
Dress Code: Casual. Very casual....
Most of the tourists / travelers are in flip flops, sarongs, tanks, and simple t shirts and shorts...
Krabi has two night markets. Some stall open on Chao Fan pier, but the real market is just off Thanon Sukhon opposite the city hotel.
It's populated by locals and tourist alike - and so avoids the worst excesses of place like the Patpong night market in Bangkok.
We were especially impressed by the range of local produce and cooking. Stalls were displayed with a real sense of pride.
By taking a little from a stall you can enjoy a good paradial grazing session.
Ao Nang was pretty quiet in my opinion and we didn't find much nightlife. But we did end up at the bar Planet Ao Nang a couple of times and we had cold beer in the warm sea breeze. We enjoyed Heiniken, Chang and Singha beer and it was pretty cheap :-) They played pretty good music while we were there and it was not too crowded.
Dress Code: The bar is on the boardwalk at the Ao Nang beach. I don't think that there was a dress code at this place.
The Green Bar is part of a bungalow complex next to Banyan Tree Resort on the back road of Ton Sai. It's a great place for a quiet drink, and probably isn't the place to go if you're looking for a big night out. It makes a great place for a drink before dinner.
Dress Code: Casual.
Another popular nighttime hang-out on TonSai is the Andaman Nature Resort. Located next to the Green Bar, the Andaman has a nice restaurant and a more communal atmosphere. The music is generally Thai covers of western songs, but it's a fun place to hang out. If you're looking to party, though, this really isn't the place.
Dress Code: Casual. No shoes allowed.
Ton Sai beach offers a fantastic view of the sunset. A great way to enjoy this is from one of the many bars along the beach. Drinks and food are cheap, the view is great, and the atmosphere superb. Two of the bigger bars are the Freedom Bar, at the Rai Lay end of the beach, and the Dream bar, at the other end. All the ones in between have something to offer too. At peak time it's not uncommon to have a beach party, the location of which alternate each night. Keep an eye out for signs and specials. You may also be invited to happy hour, which is this case usually refers to pot and not alcohol. I suspect this is largely why many of the bar staff (and some of the punters) are so relaxed.
Dress Code: Anything goes - but generally very casual. Shoes are optional.
The only active night life is to be found at the short strip at Ao Nang beach. It only has a few crowded bars as the place is not that developed yet. Besides, most travellers are more concerned about going to the beach and doing sea sports!
Dress Code: Very casual
There are a few bars concentrated at the northern end of Ao Nang (just at the point where the road heads inland). Laid back and easy going with bottled beer and cocktails the order of the day. Most have outside drinking areas on the street - big comfy bamboo and cushioned chairs, music playing (loud but too intrusive). The @rt bar was our preferred choice (good cocktails) but the Reggae Bar across the road was always busy too.
There is the occasional rave organised, but this tends to be away from the main centre on a secluded beach and entails a boat trip.
Dress Code: Shorts and T-shirts the norm.