Egypt's Red Sea and Sinai concentrate Sharm el-Sheikh's Ras Muhammad coral wall, Dahab's Blue Hole free-dive site, Hurghada's mass-tourism reef snorkelling, and the desert monastery of Saint Catherine at Mount Sinai's foot.
Red Sea diving at peak visibility, Sinai temperatures pleasant for Mount Sinai climb at sunrise, and the desert wildflowers blooming briefly in March.
Sharm and Hurghada hit 38°C, but the sea stays around 28°C and the air-conditioned reef-edge resorts run at full Russian and European package volume.
Sea at warmest, diving visibility excellent at Ras Muhammad and the Thistlegorm wreck, and pleasant temperatures for desert excursions to Coloured Canyon.
Cool dry winter with diving still excellent, Sinai mountain nights cold for Mount Sinai climbs, and Saint Catherine's monastery accessible without summer crowds.