Maldives : Hulhumalé
Preface : First of all, you may consider to stay in Hulhumalé more than 4 days after you read this post, because I am about to tell you about tips for traveling to Maldives under 100 USD a day and everything is included!
Israel : Tel Aviv+Jerusalem
Preface : I categorized Tel Aviv+Jerusalem in “3 days” category, because you need only 3 days to see those beautiful and important places. However, if you see Tel Aviv’s beach, you will be tempted to spend at least 7 days there.