We were staying in Lugano in April and got a boat to Melide to the Swissminiatur model village. If you have a Ticino card, the boat and Swissminiatur are free. We would definitely recommend the Ticino card - we found it very worthwhile.
When you get off the boat, there are no signs to the model village. You need to turn right and walk for 15-20 minutes. The model village is large and includes very detailed models of many buildings, mountains and sites around Switzerland. There are working trains, cable cars, etc. There is a ride-on train that goes round the site, a shop and restaurant, although we chose to take a picnic. There was no problem eating our picnic at one of the outside tables.
We have been to several model villages around Europe and this is one of the best. Although the models are not particularly recognisable to those not familiar with Switzerland, they are very impressive.
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