Assuming that you are collecting ALL of the open loops in your life, deciding the outcomes and next actions about them, and organizing the results of that thinking into a trusted system, here's how you go about actually getting things done.
First, use your intuition and these four criteria to decide what you should choose to do in any given moment:
- Context - What can I possibly do right now?
- Time - How much time before next time-specific thing?
- Energy - How much physical/mental energy do I have right now?
- Priority - What will provide the biggest personal payoff if I do it now?
These are the criteria you apply to work that you have defined and organized on your calendar and action lists. However, they are not the only source of work. There's a threefold nature to daily work:
- Doing pre-defined work
- Doing work as it shows up
- Defining work
So, how do you set priorities? Well, what's your job?
Given the nature of your job, it sounds like you have a lot of bullet #2 everyday. If it's your job to take care of your customers first, then that's what you should be doing when they drop by the guest services desk. You know that you're going to be interrupted frequently, so plan for it. Don't feel bad about not getting to the other things on your lists that can wait.
Make sure you do bullet #3 as often as you need to keep your lists complete and current and your mind clear. That way, when you have little pockets of discretionary time that show up during your day, you can do bullet #1 efficiently and effectively. When no guests show up, pull out the appropriate lists and get going!
Also, don't forget to do a weekly review. You may have to do it at home or off-hours if you're frequently interrupted, but make sure you do it or your system will die in very short order.
One final note. If your boss gives you an assignment with a deadline and also expects you to drop everything to service guests, then he/she made a bad decision about how to organize the job. You'll start giving customers less-than-exemplary service when you've got a deadline to meet but they keep interrupting you. Make sure you have the appropriate discussions with your boss so that you don't have conflicting objectives and expectations about your job.
You may or may not have this situation, but in case you do, you have my advice on how to deal with it.
Best of luck!