Suggestions for 3 days

Looking for suggestions.
I and with my 2 friends planning to visit iceland on this christmas from germany. We’re planning to stay in Reykjavík for 1 night and then will take some group travel packages for 3-4 days. Can anyone suggest which websites packages offering budget travel?

Or if you have any other suggestions what suit for us?

thanks in advance.

You could check out this article about budget travel in Iceland: