These are trips our operators tag as snorkelling — we surface every one that also fits an 18–35 crowd, so you're comparing like for like. Each trip shows its party and pace read, so you can judge the vibe before you book.

They start from £233 for the tour itself; the honest all-in averages about £2,061 once typical flights and tips are in. Every trip page breaks its own costs down in full — no surprises on day one.