My partner and I learnt a long time ago from a short trip that it is best never to travel to friends if you want that friendship to continue.

After an experience of a long weekend, while the friendship did not breakup, we felt we would have had a better vacation experience if we had done the weekend along rather than with our friends.

If forced to, a cardinal rule would be to arrange to meet up from point to point on the trip but avoid doing everything and anything together.

If you cannot agree on the planning details before the trip, it is unwise to continue. Sounds like you both have different values and want different things out of the tip. Does not bode well. Dont try to make it work for the sake of the friendship. Its your money and your time that you are spending.