Please choose the correct ending to complete the given sentence: Travel: [header] How to have a great river adventure [title] Begin by deciding your river route. [step] It is wise to use a part of a not-dangerous river that is regularly used by other river adventurers. The distance.

Ending1: This will depend heavily on what river you are seeking, so the distance it takes to reach the unknown water source can vary. If you are in the wilderness, see steps 3 and 4. Ending2: It will be more convenient to tread through the water then to wade under a river on foot. River hopping is very tricky because you must make a decision in advance. Ending3: The distance must be measured on an x drive/road map. Not only is it difficult to track around a river at night with an x drive, but also it is difficult to see details of river markers that lead south. Ending4: On a' medium-sized' river (that a proficient swimmer could swim across safely and easily), a group of average-fitness people can paddle up to about 20 kilometers (12 mi) in a day comfortably. [title] Plan how you'll travel to the river.

Answer format: ending1/ending2/ending3/ending4