Finnish Etiquette

Is treating them to dinner sufficient?

That sounds like a nice gesture.

Oh, and I believe they have a home sauna. Please tell me I can wear a
bathing suit!?! Want to be invited back ;-)

Every family has their own traditions and norms and the best thing is to ask them. But in general, you don't wear bathing suits in a sauna in Finland. If you feel shy, use a towel. I'm not a sauna person, but from what I've heard from Finnish friends there is a big reason for that. Bathing clothes in a sauna get wet and hot and stick to your skin which can be uncomfortable, towels are much better for that reason.

Mandatory sauna music.

You cannot wear a bathing suit. Sorry.

Thank you for your quick responses. Will be hoping for a big towel ;-)

My Finnish friends also have a sauna. We went in same sex groups, so all the women took a sauna, and then afterwards then men. I was nervous before hand, but it was fine!

Thank you for your response

Remember that you're usually asked to take a shower first and get thoroughly clean before you go in the sauna.

At least that's been my domestic experience.

-- Mike

Wow, thank you!

Yes definitely a shower before the sauna. Your friends will explain everything to you and ensure you are comfortable. But definitely no bathing suits.

Thanks everyone for your information.