As for ritual worships, Muslim on traveling is allowed to:
You'll be a Muslim Druggie.? (x
He sins.
shahaada
You could be persecuted.
he as a laugh
henna night
because muhammad was traveling at that time.
The same thing that happens if you aren't Christian or Jewish or Hindu or Buddist.
He will go to jannah at the qiyamah
You save your precious time.
The same thing that happens when a Muslim does something that is haram in their religion. Tattooing prevents a believer to do an appropriate wadu and thus the prayer or salah cannot be commenced righteously.
Medical advances that Muslim physicians made were making hospitals and by traveling to rural areas to provide healthcare. They wrote books with cures and recipes to help the sick.