What To Bring On Vacation To Help With Pain?

I need some ideas on what to bring with me, or do, on vacation to have as pain free a trip as possible. I have had this planned for a year and can't cancel. Vacation is in 3 weeks and will require a lot of walking/standing.

I have an extruded disc at L4-L5 that is compressing my L5 nerve root. The constant pain has been going on since late January. I am on Gabapentin 300mg twice a day, which is the only medication that has helped. I have an Epidural steroid injection scheduled in 1.5 weeks. I am able to work full time and can stand/walk for about 5 minutes before the pain starts. It radiates down my left leg and stops at my ankle (I used to get foot tingling). I can tell a difference in the pain getting better since it started.

Besides the meds, I have been doing the McKenzie extension exercises (1-3) and the McGill big 3. I walk as much as I can even though it's only a couple minutes at a time. I also switch out ice packs and heating pad throughout the day.

Any advice would be much appreciated.