I would get group photos done first and then smaller and smaller groups until it's just the bride and groom. Makes rounding up guests much easier (and so speeds the process up) and if the guests know the itinerary they know whether they've got time to perhaps go back to their room to freshen up/ditch the hat/raid the minibar/change into evening outfit or whatever.
If the venue is in the countryside/in an area not familiar to the guests knowing where the nearest cashpoint is can be very helpful, plus numbers for local cabs.
If any of the meals are buffets let the vegetarian guests go up before any of the other guests so they get the pick of the vegetarian options.
Don't waste money on favours, table decorations etc. It's not memorable for your guests and it's very easy when you get caught up in the wedding industry to think that they are essential. Ask yourself how many favours you can remember from weddings 2 years or more ago.
If you want people to sign guest books (or anything similar) get it done as soon as possible in the day. There's always queues while people think of something appropriate to write and you tend to miss some people and get others doing it twice. I'd be inclined to leave out lots of 6x4 cards on tables for messages and then put them in a wedding photo album after the wedding. You can then edit out any inappropriate ones. Though this shouldn't be such a problem for you as it's a dry wedding.
Do try and talk to everyone and prioritise those that have travelled a long way. You'll have loads of time to catch up with local friends and close family afterwards.
Thank people for their gifts but do personalise them. A card that just says "thanks for sharing our day" will get tossed by those who aren't worried about acknowledgement and will irritate those people who would like to know that their gift arrived safely. If you asked for money a note that says you spent it on a special experience on honeymoon or bought X for your home will go a long way to offsetting any negative feelings about the way you asked for the money (poems particularly).
Enjoy your day and try not to get stressed by anything going wrong. People remember how happy the B&G were much more than what your colour scheme was.