Your post caught my attention,,,,Why? its because chosen few nalang ang Virgin male nowadays,,,especially at your age huh,,, hehehe
Butitor - honestly, I admired your patience in waiting for the D Day and for coming out in the open to ask advices from different people.... more so that your would be "first" is your GF and not just a paid one.
I sensed nga you are preparing for it talaga. You know what? The  venue that you were asking here for doing that deed is not really a problem  kay daghan jud kaayo.
Hotel, Motel and Resort staffs are well trained on handling their clients / personal matters w/ outmost secrecy / confidentiality as long as they see you both to be of legal age already.....what concerns me most, if you don't mind, are the consequences,,,, because you will be doing it before you tie the knots and many things will happen after that. Physically, emotionally and spiritually.  
According to you , both of you and your GF are already ready and responsible now.....and ....I must also presume that you are both responsible for your own actions too. These comments you have read prior to mine are just their suggestions  and opinions, but mine is more on letting you know that there is more to that inner expressions of your feelings and love  that many are not aware of. 
Although my case is not so common,,,but  I will just share to you my personal experience for you to be aware of it should situations like these arises. Its really all up to you to weigh these things, anyways the final say is yours to make.
Nothing really happened on our wedding night, were both exhausted w/ the whole preparation and he was a bit drunk too because all his barkadas attended the party. It did happened on the  following day, that was lunch time,,,,yes, its entails a lot of patience for him because I came from a very conservative family, graduated from an exclusive school  and too shy at that. It was my first time and am sure its not his first though. I can feel he is very experienced, he is 4yrs. older than me. hahaha
It was seconded few hours later but after that,,,, my whole body aches already, there were blood stains, I had  difficulty in walking, very painful to urinate etc.etc. Before midnight we  noticed that my body temperature is rising and my skin becomes red,  itchy and irritated. I was rushed to the hospital because of breathing difficulties.
My attending physician told us that the pain is normal,,,,, but I am allergic with his sperm. We could hardly believe it....but its real.
 
Everything's well after series of clinic visits and medications. 
Am a wife, a mom of 4 adult children and 51yrs.old already, a friendly advice lang,,,,, please be aware of these   repercussions. Be  man enough to stand for her, okay?