Disney Dreamlight Valley bridges let you access new areas of locations you've unlocked. You may have seen them in locations like Dazzle Beach and the Forest of Valor. The only problem is that these bridges are often blocked by big coral rocks or large tree stumps that you can't remove with your pickaxe or shovel until you upgrade them by completing quests...
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Disney Dreamlight Valley: The secret trick for crossing blocked bridges
Source: PC Gamer (opens in a new tab)