Hi mintee,
At the expense of seeming like a sad person who doesn't go out on Sundays, here you go! =P
If you want round tables you need to get it through your caterer or food provider - whether they rent it to you at a separate charge, or it is included in your deal with them. If you want a western style dinner, then you can probably get long tables from ACM directly. Or if it is only a cocktail thing, then standing cocktail tables will suffice.
Your caterer can arrange and replace the chairs for you, according to some of the brides who have done it before. Apparently only Rasel has chair covers that fit ACM's chairs. This I have not checked out, but it would be a cost saver if you don't have to rent chairs from the caterer.
Lights and music I believe ACM will have someone in charge. If it isn't too complicated then I'm sure it will go fine. Also, if you have a helpful photographer/videographer who is doing the wedding day highlights/baby pictures montage for you, they can help to monitor the situation too.
The thing I like about ACM is that they provide you with all the tech equipment at no hidden cost, plus no one else can have an event on the river terrace even if you have not booked it.
Having a wedding offsite(like ACM, Fort Canning, the Art Museum) needs a bit more preparation on your part. You have to find your own caterer and florist and there isn't anyone to point fingers at if anything goes wrong *touch wood*. But most caterers and venues like ACM are quite comprehensive and can give you almost everything you need and point you towards other vendors. The plus about doing everything from scratch is that the sense of ownership and pride is there from the beginning, and at the end of the event, you can really think "wow, I did it!"
For me, it was hard to find a hotel that I liked as a whole. It was either the price, or the ballroom, or the ambience, or the reputation of the food that turned me off. With a "blank slate" for a venue, I can put in what I really want, and at a price I can stomach. Having said that, I think hotels still appeal because of all the factors above that Don't appeal to me. =)
Someone takes charge of everything so it is less of a hassle. It is also a safe option that the elders won't complain about. If prestige is an important factor for you and your FH, or parents, then hotels are still the way to go. The mention of a buffet wedding dinner at a non-hotel still raises doubts about quality and people wonder if you're trying to cut corners.
Happy decision making!