If you are certain you will go up the Jungfraujoch, you might look into a Half-Fare Card. This pass gives you a 50% reduction on the very expensive Jungfraujoch trip, which is 193,80 CHf for a return ticket from Interlaken Öst. Other passes like the Swiss Pass only cover the trip from Wengen on up at 25%.
The Half-Fare Card costs 99 CHf, so it will almost pay for itself on the Jungfraujoch trip.
The other Swiss Passes (Saver, Flex, etc.) work best for people who are doing longer journeys, costing more than 40 CHF or so, for the number of days on the pass. If you are basing in one place, and doing short trips, AND going up the Jungfraujoch, the Half-Fare Card may work better. However, it does not include admission to museums.
The "regular" fare from Lindau to Interlaken West, by train rather than by boat, is 93 CHF. To find out the fare for the boat route, you can put in an inquiry on SBB.ch and they will answer back.
There is a very good chart showing what the various Swiss Passes cover (and don't cover) on this website under "Railpasses". The synoptic map (link above) is helpful as well.