You should definitely ask your endo!
How I did it was that I took my total daily basal on the pump and rounded up to the nearest unit and I divided the basal into two. I took two shots of Lantus – one in the morning and one in the evening. I took a slightly larger shot in the morning because my basal rates were higher then (so I didn’t divide it exactly in half). I try to have the six hours after either shot be times when my basal rates were higher. I think that I did 9am and 6pm. I have heard many people say that they prefer Levemir to Lantus because Levemir has less of a peak in the first six hours – so you may try that. Boluses go the same as on the pump – you just need to remember your insulin to carb ratios (especially if they are different by time of day).
Switching from pumps to shots is a bit tricky, but I have never had a problem. I always try to do the switch when I can measure my blood sugar often (even every hour). If you only switch to one basal shot of Lantus, then you can just remove the pump before you give your first shot of Lantus. Because I prefer the two shots for more stable blood sugars, then what I did was to turn my basals down to 50% when I gave the first shot of Lantus (which is about half of my total daily basal) and I did this switch in the morning so I would be awake to catch any lows. I removed the pump all together at 6pm when I gave the second basal shot (again about half of the total daily basal). I preferred to give my evening shot so early so that I could check my blood sugars more often. I did the switch back to the pump in the same way.
Definitely ask you endo for advice. I have heard some say that you need MORE basal insulin (Lantus or Levemir) than your pump’s total daily basal, but this was not the case for me. This could be because I did my pump vacation during an active holiday – so I required less basal overall.
If you decide to do a pump vacation, you should also bring your pump and supplies with you so that you can decide to go back on the pump if it is not working out well!