we're staying in Luzern for not quite 3 full days- actually 2 full days and a half day either side. So 4 nights but only 2 full days to travel around. We booked a 4 day saverpass and want to take one of those days to do a scenic trip and were considering Luzern to Interlocken (golden pass) and back and then the other day possible to Mt. Titus. Wondering if we need to book in advance to reserve seats for these trips or can we book on the day? Also do the ferries or boats run this time of year? Any other suggestions/tips for such a short time would be appreciated. Thank you to ALL in advance for any replies!