As a wedding/events manager, these are the things I would suggest:
• have the time between the ceremony and dinner as short as is possible for your venue (they may need to turn rooms around etc.) It's a great time for guests to chat and catch up but no one wants to be waiting hours! Make sure you choose a venue where the guests aren't crammed waiting at this time either.
• don't go away for a long time getting photos taken. Of course you want photos to look back on but you also want to be at your wedding. The drinks reception time before dinner is a really good opportunity to relax and mingle with your guests. Some photographers can be quite pushy about having you away for hours!
• canapés at the drinks reception always go down well. Guests have often missed lunch due to getting ready/travelling to the wedding.
• always have all speeches before dinner. Those doing speeches can then relax and enjoy their meal. I would always advise trying to keep speeches fairly short. Your guests, organisers and caterers will thank you!
• having a choice for dinner is good for your guests, if this is something your venue/caterer allows. Most will ask for numbers and choices in advance.
• make sure you have a good band/DJ in the evening, one who can read the room and get everyone involved. If you're looking for a party atmosphere this is important.
• listen to your coordinator, they have the experience and skills to advise you. Some couples have ideas about how they want things to run/set up/timings etc, and while any decent coordinator would work with them on this, most of the time they know what works well and what doesn't.
• decorations are a lovely way to personalise your wedding, however don't go mad stressing over these as no one notices the intricate details. Choose things which are the style you want but are also easy and simple to organise.
• guest menu choices on place cards are super helpful because everyone forgets what they ordered!
• if having favours, either food, drink or a charity donation are all I would do. Anything else just gets left.
Hope this helps, happy planning!