2 Rookie Cruisers

Do guests have access to a microwave oven? My girl has rheumatoid arthritis and she uses a heating pad. We were told that those aren't allowed because they pose a fire hazard. I suggested one of those gel packs that you can heat up in the microwave to soothe her aching joints. But I'm not sure if there would be a microwave we could use to heat them up.

Thoughts?

What is the best way to go?

-The one-time, all inclusive tip (and give out additional tips for exemplary service)?

-Just tip as you go?

Thanks!!:D