It isn't the spicyness so much in a "hey, that's far too spicy!" way, it's more the blend of flavors. It will seem exotic to you (tandoori chicken included) if you are not used to ethnic foods. For those who like Indian, it'll seem pretty tame, and not hugely authentic.
Having said that, they have some more mild, less spiced dishes. You might consider describing to your waitperson what you do/don't like. Except for the pre-cooked things (e.g., curry sauces that stew all day), they can often adjust the spice level. I'm sure you can find many things you would like.
We often go for lunch and share some appetizers and wine. It's a good way to test the flavors. Plus, at lunch, you almost always get a fantastic view of the animals!
Have a great trip!