Probably all of them organize boat trips for one,two,three or even six days. These boat safaris are intended for diving, snorkeling or fishing and are highly recommended. Like Sinai, the climate of the Red Sea is your typical desert climate, it gets really hot during the day and it can get extremely cold by night. Temperatures can reach 48'C during a summer day, and 4'C during a winter night. The summer months of June, July and August bring really hot days with cooler nights.
Summer is considered the low season, so prices are cheaper than in the winter.
Desert Safaris during the day aren't advisable, and do drink a lot of water. As for divers, the water is warmer during the summer, the visibility is great and there's a lot more fish. Naturally, a trade off exists. During the winter months of December, January and February the weather is a lot cooler, with extremely cold nights. The water is also cooler, but still warm enough to swim and dive.