Sigiriya is built around one thing - the rock. Everything else in the area is secondary to climbing it, and that's fine because the rock deserves the focus. Fifth-century hydraulic gardens at the base, ancient frescoes halfway up, a palace at the summit. It sounds like hyperbole until you're standing at the top looking out across the jungle.
The surrounding village is small and guesthouse-focused. It's not a town with evening options - it's a base for the rock and the nearby national parks. Guests who rate Sigiriya highest tend to stay two nights - one for the rock and Pidurangala, one for Minneriya or Dambulla.
Heat is a serious factor. July-September temperatures can make the rock climb genuinely gruelling by 9am. The 7am opening exists for a reason - use it. Bring water, wear shoes with grip, and don't underestimate the stairs near the summit.