No special access issues
From May to September there is a regular ferry connection between Aegna and the mainland. More info here: https://www.tallinn.ee/et/aegna/laevaliiklus
From the harbour to the Lemmikneeme boulder field is a 1.5 km hike, and from the harbour to Eerikukivi is 2.0 km. Lemmikneeme boulder field and Eerikukivi are about 1.0 km from each other. Recommended routes are shown on the map, other similar routes are also possible.