Dahab...Where do i start...The questions are a little vague.
Are you diving at all? What qualification level are you? Are you planning on diving every day? 1 dive a day? 2? more?
Hotels, do you want all inclusive so away from town or in town?
Need more details to give a sensible answer.
June its going to be hot, probably around 40 degrees most days, sea will be in the region of 26 degrees. Expect wind in the mornings, calm in the afternoon.
Most of Dahab is shore diving although a few dive centres have boats. The vast majority of sites can be and are dived by most centres by trucks and jeep and no site is more than 30 mins travel away from the middle of town.
The "famous" site is the Blue Hole with the typical dive from Bells to the blue hole along an outside wall that drops off pretty much vertically to a few hundred metres. This site is mainly about the space, there is some decent hard coral on the saddle area but its mainly a "tick the box" dive and not the best dive there.
Canyon is normally dived on the same day as blue hole as part of a 2 dive day and is a nicer site in my view, a decent reef, decent topography and so on.
Lighthouse is the main training site in the middle of town,a nice reef but can be exceptionally crowded in summer. Eel garden further up is nice if the weather is calm. A drift from EG to lighthouse is nice but a 90 min dive so need decent air consumption.
The Islands is a really nice coral site with towering brain corals and such from the sea bed to the surface. Max depth 16m with most between 4 and 8m swimming around corals.
The other "main" sites are the southern oasis which is a large bay surrounded by mountains with some restaurants. Again crowded in summer but not TOO bad. You have golden blocks,moray gardens, 3 pools, umm sid (the best here imho) and caves (easily the worst!).
That takes care of the common ones. Really nice and rarer dived sites include Talha and Abu Helal south of Canyon. Those are probably my favourite local dives but do require decent weather (ie low wind) to do safely.
The best reef quality is in Gabr El Bint - this a dayboat out of the marina south (about 45 mins travel time on Yassmin Noran or 60 on Romy and the others). Lovely lagoon, colours, usually turtles etc and sha'ab Saeed on the way back if the wind allows. This is definitely worth a day trip and probably the best diving in Dahab.
You can also do Thistlegorm with a 5am start and 8.30pm return (3rd dive on Shark/Yolanda in Ras Mohammed) if you like wrecks.
Town has in the region of 60 dive centres and all offer the same sites at much the same price on the same schedules.
As for eating places, avoid Ali Baba - it has a massive marketing budget, all the taxi drivers get commission for dumping people there and the food is no better than any of the other standard tourist traps next to it (al capone, shark etc) but its more expensive.
Best is to avoid that line of clone restaurants altogether. If you want Italian i'd recommend El Dorado about 2 mins walk up the dark, windy corner from lighthouse, for indian try Nirvana or the Kitchen, for Thai it has to be the Blue House - possibly the best restaurant in town. Blue Beach does the best steaks in town.
Carm Inn has "different" food not the usual tourist stuff and a nice atmosphere too.
For nice day trips out of town try the Coloured and White Canyons and a trip up Mount Sinai to see sunrise (but cant dive for 24hrs prior to this due to the altitude).
Cant think of much else to add, have you got any specific questions etc you want answered?
(fwiw if you click on my flickr link below ive got a load of dahab above and underwater photos).
Breath taking views on Saudi Arabia.Ask for a room on the top floor.
