Bali Suggestions

I'm going to be heading to Bali in a few weeks. I'll arrive from Singapore at ~8am on Monday and depart ~8am the following Sunday - So 6 basically full days. I was thinking of renting a (tiny) car to get around but I am still unsure if I will. I have rented motor bikes in vietnam and Thailand so I am used to the craziness of driving. The reason I'd get a car is just because there is 2 of us so it seems a bit easier.

Looking for possible suggestions or itinerary to get the best out of it in the small amount of time we have. We like to relax with not overly touristy beaches if possible. A day of partying is ok but not the whole time. Also, not interested in paying something crazy like 300$ a night for a private beach. We are used to travelling very light and with the basics as long as the areas are beautiful. I've done without AC and without even hot water in some places with an amazing by the beach hut or bungalow but obviously i'd prefer both hehe.

Any ideas or suggestions?

Thanks a lot.