On a budget, skip French Riviera Pass — the spend outweighs the payoff.
~€28 (24h) / €40 (48h) / €58 (72h)
Can be genuinely good value if you'll pack several paid sights, a boat tour and a guided activity into a tight 24-72 hour window — it bundles entries and a few transport perks so you plan and pay less on the day. The honest catch is the maths: do an honest tally against your real plan, because a beach-and-stroll trip almost never clears the threshold.