Can't help ya on the first one. I've never been the hotels in that area. I'd say go by the beach though, as the ones closer to the clubs themselves are more the by-the-hour or by-the-week kinda places.
Dress code is casual, I wear t-shirt/polo, shorts, and flip flops/sneakers mostly. BT will give you grief about flip flops at night on the weekends. But anything is fine, there's plenty of people in there in jeans or pants, some people in athletic shorts and shit.
I wouldn't walk from club to club. I mean, you could, but I wouldn't recommend it. Certainly not with hundreds of dollars in your pocket. Spend the $15 and Uber it.
As far as order, Your preferences matter, and time of day matters too. I think Cheetah is overall the best and suits the widest range. It's certainly the most consistent. BT is still more of a party vibe, which can be offputting to some. More expensive drinks, but cheaper rooms. DD's vibe varies. On busy shifts it's a little more party vibe than Cheetah but on slower shifts it's more mellow. The rooms are cheap, but they are tiny and only about 10 minutes (songs), and the girls are super mechanical. BT IMO is better during the day than at night, Cheetah is good day/night, and DD tends to be better at night than day. Cheetah's chicks are hotter, especially if you like em slim and fit. BT's got thicker girls, and DD's still got lots of plastic.
If I was coming in from out of town, and it was daytime I'd start at Cheetah. If it was time to move on and it was after 8pm I'd hit up DD. If it was before 5pm, I'd hit up BT. If it was in-between, flip a coin. You could also try Solid Gold after 10pm, but if you're ubering that's gonna cost ya $30-40 bucks to get to/from another club.