My sister‘s friends go every year and charter a boat and skipper and sail the Greek Isles. It is only 3,250 Euros a week. You get four large cabins for sleeping, and you can even hire a hostess to cook. When you divide that up with four couples it is super reasonable. A hotel for 7 nights would more expensive. The best part is you see a bunch of different islands but you never have to move your luggage.